Metallocenes and catalyst compositions derived therefrom

ABSTRACT

Metallocenes and catalyst systems for olefin polymerization derived therefrom. The metallocenes may be represented by the formula: 
                         
wherein M 1  preferably is zirconium or hafnium; and R 5  is different from hydrogen.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a National Stage Application of InternationalApplication No. PCT/US01/48719, filed Dec. 10, 2001.

FIELD

This invention relates to metallocene compounds and their use in thepreparation of catalyst compositions for olefin polymerization,particularly propylene homo- and copolymerization. The present inventionalso relates to polymerization processes using such catalystcompositions and polymer compositions obtainable by these processes.

BACKGROUND

The use of metallocene compositions in olefin polymerization is wellknown. Metallocenes containing substituted, bridged indenyl derivativesare noted for their ability to produce isotactic propylene polymershaving high isotacticity and narrow molecular weight distribution.Considerable effort has been made toward obtaining metallocene producedpropylene polymers having ever-higher molecular weight and melting pointand, thus, ever better strength (impact) properties, while maintainingsuitable catalyst activity.

Toward this end researchers have found that there is a directrelationship between the way in which a metallocene is substituted andthe molecular structure of the resulting polymer. For the substituted,bridged indenyl type metallocenes, it is now well established that thetype and arrangement of substituents on the indenyl groups, as well asthe type of bridge connecting the indenyl groups, determines suchpolymer attributes as molecular weight and melting point.

For example, U.S. Pat. Nos. 5,840,644 and 5,770,753, incorporated hereinby reference in their entireties, describe certain metallocenescontaining aryl-substituted indenyl derivatives as ligands, which aresaid to provide propylene polymers having high isotacticity, narrowmolecular weight distribution and very high molecular weight.

Likewise, U.S. Pat. No. 5,936,053, incorporated herein by reference inits entirety, describes certain metallocene compounds said to be usefulfor producing high molecular weight propylene polymers. Thesemetallocenes have a specific hydrocarbon substituent at the 2 positionand an unsubstituted aryl substituent at the 4 position on each indenylgroup of the metallocene compound.

WO 98/40419 and WO 99/42497 both describe certain supported catalystsystems for producing propylene polymers having high melting point.Metallocene compositions and their activators are often combined with asupport material in order to obtain a catalyst system that is lesslikely to cause reactor fouling. However, it is known that supportedmetallocene catalyst systems tend to result in a polymer having lowermelting point than would otherwise be obtained if the metallocenes werenot supported.

Much of the current research in this area has been directed toward usingmetallocene catalyst systems under commercially relevant processconditions, to obtain propylene polymers having melting points higherthan known metallocene catalyst systems and close to, or as high as,propylene polymers obtained using conventional, Ziegler-Natta catalystsystems. The present inventors have discovered metallocene compoundsthat not only have this capability, but retain it upon supportation.

Additionally, it would be desirable to have available metallocenes whichnot only afford propylene homopolymers having high melting points of(i.e., high stereotacticity), but also elastomeric copolymers having thehigh molecular weights required for the production of, e.g., impactcopolymers, thereby making possible the production of satisfactory insitu blends of, e.g., propylene homopolymer and ethylene-propylenerubbers (EPR's) with a single catalyst composition in a single reactoror in a series of two or more reactors. The present inventors have foundmetallocene compounds which in combination with a cocatalyst (activator)make both propylene homopolymers having high melting points andelastomeric copolymers that are suitable for the production of impactcopolymers in combination with these propylene homopolymers.

SUMMARY OF THE INVENTION

The present invention relates to novel metallocene compounds capable ofproviding propylene homo- and copolymers having high melting point andhigh molecular weight. The present invention further relates tometallocene catalyst compositions comprising one or more of thesecompounds and one or more activators or cocatalysts, and optionally,support material, and to the use of such catalyst compositions inpolymerization, in particular propylene polymerization.

In one aspect, the present invention provides metallocene compoundsrepresented by formula (I):

wherein:

M¹ is selected from titanium, zirconium, hafnium, vanadium, niobium,tantalum, chromium, molybdenum and tungsten;

R¹ and R² are selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsand C₇–C₄₀ arylalkenyl groups; or R¹ and R² are joined together to forma C₄–C₄₀ alkanediyl group or a conjugated diene ligand which iscoordinated to M¹ in a metallacyclopentene fashion; or R¹ and R²represent a conjugated diene, optionally substituted with one or moregroups independently selected from hydrocarbyl, trihydrocarbylsilyl andtrihydrocarbylsilylhydrocarbyl groups, said diene having a total of upto 40 atoms not counting hydrogen and forming a π complex with M¹;

R³ is selected from hydrogen, halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ arylgroups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylarylgroups, C₈–C₄₀ arylalkenyl groups, and —NR′₂, —SR′, —OR′, —SiR′₃,—OSiR′₃ and —PR′₂ radicals wherein each R′ is independently selectedfrom halogen, C₁–C₁₀ alkyl groups and C₆–C₁₄ aryl groups;

R⁴, R⁶ and R⁷ are each independently selected from hydrogen, halogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,and —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ and —PR′₂ radicals wherein eachR′ is independently selected from halogen, C₁–C₁₀ alkyl groups andC₆–C₁₄ aryl groups; or R⁶ and R⁷ together with the atoms connecting themmay form one or more rings;

R⁵ is selected from halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups,C₈–C₄₀ arylalkenyl groups, and —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ and—PR′₂ radicals wherein each R′ is independently selected from halogen,C₁–C₁₀ alkyl groups and C₆–C₁₄ aryl groups; provided that if R⁶ ismethyl or F, R⁵ is different from R⁶;

R⁸, R⁹, R¹⁰, R¹¹ and R¹² are each independently as defined for R⁴, R⁶and R⁷, provided that if R⁸, R⁹, R¹¹ and R¹² all are hydrogen, then atleast one of R³, R⁵ and R¹⁰ is different from methyl, with R¹⁰ beingdifferent from hydrogen; and further provided that if R⁸, R¹⁰ and R¹²all are hydrogen, R³ is ethyl and R⁵ is methyl, then at least one of R⁹and R¹¹ is different from methyl;

R¹³ is selected from

—B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —SO—, —O—, —S—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)— —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— and —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—;

wherein:

R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups andC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and

M³ is selected from carbon, silicon, germanium and tin; or

R¹³ is represented by the formula

wherein:

R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are each independentlyselected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkyl groups, C₁–C₁₀alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups, C₂–C₁₀ alkenylgroups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups and C₈–C₄₀arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸, R¹⁹, R²⁰,R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together with the atomsconnecting them, form one or more rings; and M² represents one or morecarbon atoms, or a silicon, germanium or tin atom (where M² representsmore than one atom, preferably each M² atom is bound such that no one M²atom is bound to both indenyl moieties).

In preferred embodiments of the above compound, M¹ is selected fromtitanium, zirconium and hafnium.

In one aspect, R¹ and R² are selected from chlorine, C₁–C₆ alkyl groups,C₆–C₁₀ aryl groups, C₇–C₁₂ arylalkyl groups and C₇–C₁₂ alkylaryl groups.For example, R¹ and R² may be methyl.

In another aspect, R³ may be a C₁–C₆ alkyl group such as, e.g., a C₁–C₄alkyl group and, in particular, an isopropyl group, or may be a phenylgroup.

Preferably, at least one of R⁴ and R⁸, and most preferred both of them,represent hydrogen atoms. For example, R⁴, R⁸ and R¹² may all behydrogen atoms.

In yet another aspect, R⁵ may be a C₁–C₆ alkyl group, e.g., a methylgroup, or may be a phenyl group.

In a further aspect, R¹² may be hydrogen. For example, R¹² may behydrogen and at least one of R⁹ and R¹¹ may different from hydrogen.

In another aspect, R⁹ and R¹¹ represent a C₁–C₄ alkyl group such asmethyl or tert-butyl, or a phenyl group.

In the above formula, M³ may, for example, be selected from carbon andsilicon, and R¹⁴, R¹⁵ and R¹⁶ may independently be selected from C₁–C₄alkyl groups and C₆–C₁₀ aryl groups. Moreover, when R¹³ is representedby the formula:

R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ may each be hydrogen, with M²representing a silicon atom.

Particularly preferred compounds of the above formula include thosewherein R¹ and R² are selected from chlorine, methyl, neopentyl andbenzyl, R³ is selected from C₁–C₄ alkyl groups, each of R⁴, R⁸ and R¹²is hydrogen, and R⁵ is selected from C₁–C₄ alkyl groups and C₆–C₁₀ arylgroups; wherein R³ is selected from branched C₃–C₄ alkyl groups and R⁵is selected from C₁–C₄ alkyl groups; wherein R³ is selected fromisopropyl, isobutyl, sec-butyl, tert-butyl and phenyl groups, and R⁵ isselected from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl,sec-butyl, tert-butyl, phenyl, tolyl, benzyl and naphthyl groups; andwherein M¹ is selected from zirconium and hafnium; R¹ and R² areselected from chlorine, C₁–C₃ alkyl groups and C₆–C₁₀ aryl groups; R³ isselected from C₁–C₄ alkyl groups and C₆–C₁₀ aryl groups; R⁴ and R⁸ arehydrogen; R⁵, R⁶, R⁷, R⁹, R¹⁰, R¹¹ and R¹² are each independentlyselected from hydrogen, halogen and C₁–C₄ alkyl groups; R⁵ is selectedfrom C₁–C₆ alkyl groups and C₆–C₁₀ aryl groups; and R¹³ is selected fromdi(C₁–C₄ alkyl)silanediyl, diphenylsilanediyl, (C₁–C₄alkyl)phenylsilanediyl, diphenylmethanediyl and C₂–C₄ alkanediyl andalkenediyl radicals, and groups of the formula:

wherein:

R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are each independentlyselected from hydrogen, halogen and C₁–C₃ alkyl groups; and

M² represents a carbon or silicon atom.

In another aspect, R¹³ may be selected from di(C₁–C₄ alkyl)silanediyl,diphenylsilanediyl, (C₁–C₄ alkyl)phenylsilanediyl, C₂–C₄ alkanediyl andalkenediyl, di(C₁–C₄ alkyl)amidoborane and bis[tri(C₁–C₄alkyl)silyl]amidoborane radicals.

Other preferred compounds of the above formula may comprise not morethan 2% of the meso isomer.

In another aspect, the metallocenes of this invention are represented bythe above formula (I), wherein:

M¹ is selected from titanium, zirconium, hafnium, vanadium, niobium,tantalum, chromium, molybdenum and tungsten;

R¹ and R² are selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsand C₇–C₄₀ arylalkenyl groups; or R¹ and R² are joined together to forman alkanediyl group or a conjugated C₄–C₄₀ diene ligand which iscoordinated to M¹ in a metallacyclopentene fashion; or R¹ and R²represent a conjugated diene, optionally substituted with one or moregroups independently selected from hydrocarbyl, trihydrocarbylsilyl andtrihydrocarbylsilylhydrocarbyl groups, said diene having a total of upto 40 atoms not counting hydrogen and forming a π complex with M¹;

R³ is selected from hydrogen, halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ arylgroups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylarylgroups, C₈–C₄₀ arylalkenyl groups, and —NR′₂, —SR′, —OR′, —SiR′₃,—OSiR′₃ and —PR′₂ radicals wherein each R′ is independently selectedfrom halogen, C₁–C₁₀ alkyl groups and C₆–C₁₄ aryl groups;

R⁴, R⁶ and R⁷ are each independently selected from hydrogen, halogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,and —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ and —PR′₂ radicals wherein eachR′ is independently selected from halogen, C₁–C₁₀ alkyl groups andC₆–C₁₄ aryl groups; or R⁶ and R⁷ together with the atoms connecting themmay form one or more rings;

R⁵ is selected from halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups,C₈–C₄₀ arylalkenyl groups, and —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ and—PR′₂ radicals wherein each R′ is independently selected from halogen,C₁–C₁₀ alkyl groups and C₆–C₁₄ aryl groups;

R⁸, R⁹, R¹⁰, R¹¹ and R¹² are each independently as defined for R⁴, R⁶and R⁷, provided that two or more adjacent radicals R⁸, R⁹, R¹⁰, R¹¹ andR¹² together with the atoms connecting them may form one or more rings;

R¹³ is selected from diphenylsilanediyl, (C₁–C₄ alkyl)phenylsilanediyl,di(C₁–C₄ alkyl)amidoborane and bis[tri(C₁–C₄ alkyl)silyl]amidoboraneradicals and groups of the formula:

wherein:

R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are each independentlyselected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkyl groups, C₁–C₁₀alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups, C₂–C₁₀ alkenylgroups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups and C₈–C₄₀arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸, R¹⁹, R²⁰,R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together with the atomsconnecting them, form one or more rings; and

M² represents a carbon, silicon or germanium atom.

In yet another aspect, the metallocenes of this invention arerepresented by the above formula (I), wherein:

M¹ is selected from titanium, zirconium and hafnium;

R¹ and R² are selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsand C₇–C₄₀ arylalkenyl groups, provided that at least one of R¹ and R²is different from halogen; or R¹ and R² are joined together to form aC₄–C₄₀ alkanediyl group or a conjugated C₄–C₄₀ diene ligand which iscoordinated to M¹ in a metallacyclopentene fashion; or R¹ and R²represent a conjugated diene, optionally substituted with one or moregroups independently selected from hydrocarbyl, trihydrocarbylsilyl andtrihydrocarbylsilylhydrocarbyl groups, said diene having a total of upto 40 atoms not counting hydrogen and forming a π complex with M¹;

R³ is selected from hydrogen, halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ arylgroups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylarylgroups, C₈–C₄₀ arylalkenyl groups, and —NR′₂, —SR′, —OR′, —SiR′₃,—OSiR′₃ and —PR′₂ radicals wherein each R′ is independently selectedfrom halogen, C₁–C₁₀ alkyl groups and C₆–C₁₄ aryl groups;

R⁴, R⁶ and R⁷ are each independently selected from hydrogen, halogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,and —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ and —PR′₂ radicals wherein eachR′ is independently selected from halogen, C₁–C₁₀ alkyl groups andC₆–C₁₄ aryl groups; or R⁶ and R⁷ together with the atoms connecting themmay form one or more rings;

R⁵ is selected from halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups,C₈–C₄₀ arylalkenyl groups, and —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ and—PR′₂ radicals wherein each R′ is independently selected from halogen,C₁–C₁₀ alkyl groups and C₆–C₁₄ aryl groups;

R⁸, R⁹, R¹⁰, R¹¹ and R¹² are each independently as defined for R⁴, R⁶and R⁷, provided that two or more adjacent radicals R⁸, R⁹, R¹⁰, R¹¹ andR¹² together with the atoms connecting them may form one or more rings;

R¹³ is selected from

—B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)— —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— and —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—;

wherein:

R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups andC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and

M³ is selected from carbon, silicon, germanium and tin; or R¹³ isrepresented by the formula

wherein:

R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are each independentlyselected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkyl groups, C₁–C₁₀alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups, C₂–C₁₀ alkenylgroups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups and C₈–C₄₀arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸, R¹⁹, R²⁰,R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together with the atomsconnecting them, form one or more rings; and

M² represents one or more carbon atoms, or a silicon, germanium or tinatom.

Preferred embodiments of the above compounds are those already givenbefore.

The present invention also provides a catalyst composition whichcomprises the product of a compound of at least one of the abovemetallocene compounds of the present invention and a cocatalyst. Thecocatalyst may be a compound comprising a non-coordinating anion (e.g.,a non-coordinating anion comprising at least one unit of the formula—B(C₆F₅)₃) and/or may be an alumoxane, e.g., methylalumoxane. Thecatalyst composition may comprise a support material, e.g., an inorganicmaterial such as silica, alumina, silica-alumina and magnesium chloride.

Preferred support materials include silica having a surface area rangingfrom 10 to 700 m²/g, a total pore volume ranging from 0.1 to 4.0 cc/gand an average particle size ranging from 10 to 500 μm.

The present invention further provides a polymerization process whichcomprises contacting, under polymerization conditions, one or moreethylenically unsaturated monomers and a catalyst composition as definedabove.

The ethylenically unsaturated monomers preferably are selected frommonoolefins, diolefins and mixtures thereof. Illustrative andnon-limiting examples of suitable monoolefins are compounds of theformula R^(a)CH═CHR^(b) wherein R^(a) and R^(b) are each independentlyselected from hydrogen, alkyl and alkenyl radicals having 1 to 14 carbonatoms or, together with the carbon atoms to which they are connected,form a ring having 4 to 8 carbon atoms. Preferred monoolefins includeethylene and α-olefins having from 3 to 12 carbon atoms such as, e.g.,propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene and mixturesthereof. In a preferred embodiment, the ethylenically unsaturatedmonomers consist essentially of ethylene and propylene.

In one aspect of the above process, the temperature ranges from about30° C. to about 80° C. In another aspect, the process is carried out ata pressure ranging from about 5 to about 64 bar.

DETAILED DESCRIPTION

In the following detailed description, unless otherwise stated, allpercentages, parts, ratios, etc., are by weight.

Also, unless otherwise stated, a reference to a compound or componentincludes the compound or component by itself, its individualstereoisomers and any mixtures thereof, of as well as any combinationwith other compounds or components, such as mixtures of compounds.

Further, when an amount, concentration, or other value or parameter, isgiven as a list of upper preferable values and lower preferable values,this is to be understood as specifically disclosing all ranges formedfrom any pair of an upper preferred value and a lower preferred value,regardless whether ranges are separately disclosed.

Additionally, as utilized herein, the following terms have the meaningsindicated below.

The term “product” in connection with the catalyst composition of thepresent invention includes any species that is different in any respectfrom the completely independent and individual materials, i.e., themetallocene compound (catalyst precursor) and the cocatalyst(activator). By way of illustrative, non-limiting example, theseindividual materials may have interacted or even reacted, giving rise toa contact product and/or reaction product.

The term “alkyl”, means a straight-chain, branched-chain or cyclic alkylradical. Examples of such radicals include, but are not limited to,methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl,tert-butyl, pentyl, iso-amyl, hexyl, 2-ethylhexyl, octyl, cyclopentyl,cyclohexyl and the like. The cyclic alkyl radicals may be substitutedwith one or more straight-chain and/or branched-chain alkyl radicals(i.e., may be alkylcycloalkyl radicals such as, e.g., methylcyclohexyletc.). Conversely, the straight-chain and branched-chain alkyl radicalsmay be substituted with one or more cyclic alkyl radicals (i.e., may becycloalkylalkyl radicals such as cyclohexylmethyl etc.). Moreover,unless indicated otherwise, the above alkyl radicals may be substitutedby one or more groups preferably and independently selected from halogen(e.g., F, Cl, Br), alkoxy (e.g., methoxy, ethoxy, propoxy, butoxy andthe like), hydroxy, amino, monoalkylamino (e.g., methylamino,ethylamino, propylamino and the like) and dialkylamino (e.g.,dimethylamino, diethylamino, dipropylamino, diisopropylamino, piperidinoand the like) and trihydrocarbylsilyl (e.g., trimethylsilyl,triphenylsilyl and the like).

The term “alkenyl” means “alkyl” as defined above having one or moredouble and/or triple bonds. Examples of alkenyl radicals include, butare not limited to, ethenyl, propenyl, allyl, butenyl, propargyl,1,4-butadienyl, isopropenyl, cyclopentenyl, cyclohexenyl, cyclooctenyl,cyclopentadienyl, cyclohexadienyl, cyclooctadienyl and the like.

The term “alkoxy” means an alkyl or alkenyl ether radical wherein theterms “alkyl” and “alkenyl” are as defined above. Examples of suitablealkyl ether radicals include, but are not limited to, methoxy, ethoxy,n-propoxy, isopropoxy, n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy,allyloxy, trifluoromethoxy and the like.

The term “aryl” means an aromatic radical, for example, a phenyl,naphthyl, azulenyl, phenanthryl or anthracenyl radical and the likewhich optionally contains one or more (e.g., 2 or 3) heteroatoms(preferably selected from N, O and S and combinations thereof) in thering and/or carries one or more identical or different substituents, forexample, alkoxy, aryl, halogen, hydroxy, amino, monoalkylamino,dialkylamino, nitro, trihydrocarbylsilyl, alkyl-CO, alkylsulfonyl,alkyl-OCO etc., these terms being as defined herein. Illustrative,non-limiting examples of aryl radicals are phenyl, naphthyl, fluorenyl,chlorophenyl, dichlorophenyl, fluorophenyl, perfluorophenyl,hydroxyphenyl, anisyl, biphenyl, nitrophenyl, acetylphenyl, aminophenyl,pyridyl, pyridazyl, quinolyl, and the like. When carbon numbers aregiven herein for aryl radicals, ring heteroatoms are counted as carbonatoms.

The term “aryloxy” means an aryl ether radical wherein the term “aryl”is as defined above.

The term “alkylaryl” means an aryl radical carrying at least one alkyland/or alkenyl radical as ring substituent, the terms “aryl”, “alkyl”and “alkenyl” being as defined above. Illustrative, non-limitingexamples of alkylaryl groups are tolyl, xylyl, mesityl, ethylphenyl,trifluoromethylphenyl, vinylphenyl, cumyl, methylpyridyl and the like.

The term “arylalkyl” means an alkyl radical carrying at least one arylgroup wherein the terms “aryl” and “alkyl” are as defined above,provided that the aryl radical may have one or more alkyl substituents.Illustrative, non-limiting examples of arylalkyl groups are benzyl,phenethyl, diphenylmethyl, tolylmethyl, naphthylmethyl and the like.

The term “arylalkenyl” means an alkenyl radical carrying at least onearyl substituent wherein the terms “aryl” and “alkenyl” are as definedabove, provided that the aryl radical may have one or more alkylsubstituents. Illustrative, non-limiting examples of arylalkenyl groupsare styryl, methylstyryl, phenylpropenyl, 1-phenyl-1,4-butadienyl andthe like.

The term “halogen” means fluorine, chlorine, bromine and iodine.

The term “hydrocarbyl” encompasses alkyl, alkenyl, arylalkyl,arylalkenyl and alkylaryl groups as defined above. Preferred hydrocarbylgroups comprise 1 to 20, more preferred 1 to 10, and most preferred 1 to6 carbon atoms. Illustrative, non-limiting examples are methyl, ethyl,propyl and phenyl.

Unless specified otherwise herein, preferred meanings of the variousgroups defined above are:

Alkyl: linear and branched alkyl groups having 1 to 8, particularly 1 to6, and even more preferred, 1 to 4 carbon atoms (such as, e.g., methyl,ethyl, propyl and isopropyl). If present, substituents are preferablyselected from halogen and alkoxy, more preferred from F, Cl, methoxy andethoxy, most preferred from F and Cl.

Alkoxy: the preferred alkyl groups connected to an oxygen atom, morepreferred methoxy and ethoxy.

Alkenyl: linear and branched alkenyl groups having 2 to 8, particularly2 to 6, and even more preferred, 2 to 4 carbon atoms (such as, e.g.,vinyl, allyl, and 2-butenyl). If present, substituents are preferablyselected from halogen and alkoxy, more preferred from F, Cl, methoxy andethoxy, most preferred from F and Cl.

Aryl: aryl groups containing 6 to 12, more preferred 6 to 10 carbonatoms, such as, e.g., phenyl, naphthyl and biphenyl. Preferably noheteroatoms are present on the ring system. If present, substituents arepreferably selected from halogen and alkoxy, more preferred from F, Cl,methoxy and ethoxy, most preferred from F and Cl. Whenever specific arylgroups such as phenyl, naphthyl and biphenyl are mentioned in thespecification and/or the claims, unless stated otherwise these arylgroups may carry one, two, three or more substituents which may be thesame or different and are preferably selected from alkyl (as definedabove), halogen and alkoxy.

Aryloxy: the preferred aryl groups attached to an oxygen atom. Mostpreferred are phenoxy and naphthoxy.

Arylalkyl and alkylaryl: the preferred aryl groups in combination withthe preferred alkyl groups, the total number of carbon atoms being 7 to20, more preferred 7 to 12. Particularly preferred examples includebenzyl, phehethyl, tolyl and xylyl.

Arylalkenyl: the preferred aryl groups in combination with the preferredalkenyl groups, the total number of carbon atoms being 8 to 20, morepreferred 8 to 12. Particularly preferred examples include styryl andchlorostyryl.

Halogen: F, Cl and Br, more preferred F and Cl.

Preferred meanings of the various constituents of the compounds offormula (I) above are as follows, it being understood that thesepreferred meanings are defined as above, including the preferredembodiments of a particular meaning. For example, “alkyl” means an alkylgroup as defined above, preferred meanings thereof being also as definedabove.

M¹: titanium, zirconium, hafnium; more preferred are zirconium andhafnium, with zirconium being most preferred.

R¹ and R²: halogen (more preferred Cl and Br), alkyl (more preferredmethyl and neopentyl), aryl (more preferred phenyl), alkylaryl (morepreferred tolyl) and arylalkyl (more preferred benzyl); or R¹ and R² arejoined together to form a C₄₋₆ alkanediyl group or a conjugated C₄–C₆diene ligand which is coordinated to M¹ in a metallacycloalkane or-cycloalkene fashion; or R¹ and R² represent a conjugated diene,optionally substituted with one or more groups independently selectedfrom alkyl, aryl, trialkylsilyl and trialkylsilylalkyl groups, saiddiene having a total of up to 30, e.g., up to 24 atoms not countinghydrogen and forming a π complex with M¹. Illustrative, non-limitingexamples of conjugated dienes are 1,4-diphenyl-1,3-butadiene,1,3-pentadiene, 2-methyl-1,3-pentadiene, 2,4-hexadiene,1-phenyl-1,3-pentadiene, 1,4-dibenzyl-1,3-butadiene,1,4-ditolyl-1,3-butadiene, 1,4-bis(trimethylsilyl)-1,3-butadiene, and1,4-dinaphthyl-1,3-butadiene. While R¹ and R² may be different, they arepreferably the same. The most preferred meanings of R¹ and R² are Cl andmethyl.

R³: alkyl, aryl, alkylaryl and arylalkyl. More preferred meanings aremethyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl,tert-butyl, phenyl, naphthyl, tolyl and benzyl, even more preferredisopropyl, benzyl and phenyl. Most preferred is isopropyl.

R⁴, R⁶ and R⁷: hydrogen, alkyl and aryl (particularly phenyl), morepreferred hydrogen and alkyl. Illustrative, non-limiting examples arehydrogen, methyl and ethyl. For R⁴, a particularly preferred meaning ishydrogen. In another preferred embodiment, all of R⁴, R⁵, R⁶ and R⁷ arehydrogen.

R⁵: alkyl, aryl, alkylaryl, arylalkyl and trialkylsilyl. More preferredmeanings are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl,sec-butyl, tert-butyl, phenyl, naphthyl, (o-, m- and p-)tolyl, benzyland trimethylsilyl.

R⁸, R⁹, R¹⁰, R¹¹ and R¹²: hydrogen, alkyl, arylalkyl (particularlybenzyl) and aryl (particularly phenyl), more preferred hydrogen andalkyl. Illustrative, non-limiting examples are hydrogen, methyl andethyl. For R⁸, a particularly preferred meaning is hydrogen. In anotherpreferred embodiment, all of R⁸, R⁹, R¹⁰ and R¹¹ are hydrogen. While instill another preferred embodiment at least one of R⁹ and R¹¹ isdifferent from hydrogen, it is particularly preferred for R¹¹ to bedifferent from hydrogen when R¹² represents methyl or ethyl.

R¹³: dialkylsilanediyl, diarylsilanediyl, (aryl)(alkyl)silanediyl,amidoborane, alkylene, arylalkylene and arylene, the latter groups beingderived from the defined alkyl, arylalkyl and aryl radicals. Morepreferred as alkyl and aryl groups are methyl, ethyl, propyl, butyl andphenyl. More preferred alkylene, arylalkylene and arylene radicals areethylene, propylene, butylene, phenylmethylene and diphenylmethylene aswell as phenylene. More preferred dialkylsilanediyl, diarylsilanediyland (aryl)(alkyl)silanediyl radicals are dimethylsilanediyl,diethylsilanediyl, dipropylsilanediyl, dibutylsilanediyl,methylphenylsilanediyl and diphenylsilanediyl. More preferredamidoborane radicals are dialkylamidoborane, diarylamidoborane andbis(trialkylsilyl)amidoborane radicals. Illustrative, non-limitingexamples thereof are dimethyl-amidoborane, diethylamidoborane,diisopropylamidoborane, diphenylamido-borane andbis(trimethylsilyl)amidoborane. Other preferred meanings of R¹³ are9-fluorenyl and 9-silafluorenyl. R¹³ is usually connected to the1-positions of the indenyl ring systems.

Furthermore, whenever it is stated in the present specification and/orin the claims that a certain radical (e.g., R) “is different from” oneor more recited groups, unless stated otherwise this phrase means thatthis radical can have any of its other indicated meanings, includinghydrogen.

The following are illustrative, non-limiting examples of metallocenes ofthe present invention:

-   dimethylsilanediylbis[1-(2-ethyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-methyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-trifluoromethyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-trimethylsilyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-trifluoromethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-trimethylsilyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5,6-trimethyl-4-(3,5-dimethyl)phenyl)indenyl]}-zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2,5-diethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-ethyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-ethyl-5-n-propyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2,5-di-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-n-propyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-ethyl-5-isopropyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2,5-diisopropyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-isopropyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-ethyl-5-n-butyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-di-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-n-butyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-ethyl-5-isobutyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-5-isobutyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2,5-diisobutyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-isobutyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-ethyl-5-sec-butyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-5-sec-butyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2,5-di-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-sec-butyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-ethyl-5-tert-butyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-5-tert-butyl    4-phenylindenyl)]zirconium dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2,5-di-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(5-tert-butyl-2,4-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-methyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-ethyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-propyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isopropyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-n-butyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-isobutyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-sec-butyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2-tert-butyl-4,5-diphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis[1-(2,4,5-triphenylindenyl)]zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,4-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3,4-trimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3,5-trimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3,4,5-tetramethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-isopropylpheny)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanedlylbis{1-[2-methyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   dimethylsilanediylbis[1-(2,5-dimethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-methyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-trifluoromethyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-trimethylsilyl-5-methyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-trifluoromethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-trimethylsilyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2,5,6-trimethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-ethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2,5-diethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-5-ethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-5-ethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-5-ethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-5-ethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-5-ethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-5-ethyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-ethyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-n-propyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-5-n-propyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2,5-di-n-propyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-5-n-propyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-5-n-propyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-n-propyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-isopropyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-5-isopropyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-5-isopropyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2,5-diisopropyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-5-isopropyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-isopropyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-n-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-5-n-butyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-5-n-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-5-n-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-di-n-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-5-n-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-5-n-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-5-n-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-n-butyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-isobutyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-5-isobutyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-5-isobutyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-5-isobutyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-5-isobutyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2,5-diisobutyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-5-isobutyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-5-isobutyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-isobutyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-sec-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-5-sec-butyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-5-sec-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-5-sec-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-5-sec-butyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-5-sec-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2,5-di-sec-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-5-sec-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-sec-butyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-5-tert-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-5-tert-butyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-5-tert-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-5-tert-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-5-tert-butyl    4-phenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-5-tert-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-5-tert-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2,5-di-tert-butyl-4-phenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(5-tert-butyl-2,4-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-methyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-ethyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-propyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isopropyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-n-butyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-isobutyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-sec-butyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2-tert-butyl-4,5-diphenylindenyl)]zirconium    dimethyl;-   dimethylsilanediylbis[1-(2,4,5-triphenylindenyl)]zirconium dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,4-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3,4-trimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3,5-trimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2,3,4,5-tetramethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanedlylbis{1-[2-n-propyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-methylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-ethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(2-biphenylyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}-zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diisopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-di-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-phenyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-methyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-ethyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-propyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isopropyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-n-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-isobutyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-sec-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2-tert-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   dimethylsilanediylbis{1-[2,5-diphenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dimethyl;-   9-silafluorenediyl[1-(2,5-dimethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-propyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isobutyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-methyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-trifluoromethyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-trimethylsilyl-5-methyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-trifluoromethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-trimethylsilyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2,5,6-trimethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2,5-diethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-propyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isobutyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-5-ethyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-ethyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-5-n-propyl 4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2,5-di-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isobutyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-5-n-propyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-n-propyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-5-isopropyl 4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-propyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2,5-diisopropyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isobutyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-5-isopropyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-isopropyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-5-n-butyl 4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-propyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-di-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isobutyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-5-n-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-n-butyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-5-isobutyl 4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-propyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-5-isobutyl    4-phenylindenyl)]zirconium dichloride;-   9-silafluorenediyl[1-(2,5-diisobutyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-5-isobutyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-isobutyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-5-sec-butyl 4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-propyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-5-sec-butyl    4-phenylindenyl)]zirconium dichloride;-   9-silafluorenediyl[1-(2-isobutyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2,5-di-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-5-sec-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-sec-butyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-5-tert-butyl    4-phenylindenyl)]zirconium dichloride;-   9-silafluorenediyl[1-(2-n-propyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-5-tert-butyl    4-phenylindenyl)]zirconium dichloride;-   9-silafluorenediyl[1-(2-isobutyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-5-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2,5-di-tert-butyl-4-phenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(5-tert-butyl-2,4-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-methyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-ethyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-propyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isopropyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-n-butyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-isobutyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-sec-butyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2-tert-butyl-4,5-diphenylindenyl)]zirconium    dichloride;-   9-silafluorenediyl[1-(2,4,5-triphenylindenyl)]zirconium dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2,3-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2,4-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2,3,4-trimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2,3,5-trimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2,3,4,5-tetramethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(2-methylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(2-ethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(2-isopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(2-biphenylyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}-zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diisopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-di-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-phenyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-methyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-ethyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-propyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isopropyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-n-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-isobutyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-sec-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2-tert-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;-   9-silafluorenediyl{1-[2,5-diphenyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium    dichloride;

as well as the corresponding compounds wherein:

-   -   the dimethylsilanediyl or 9-silafluorenediyl radical,        respectively, in the above compounds is replaced by a        dimethylamidoborane, diisopropylamidoborane or        bis(trimethylsilyl)amidoborane radical; and/or    -   the zirconium dichloride or zirconium dimethyl radical,        respectively, in the above compounds is replaced by        η⁴-1,4-diphenyl-1,3-butadiene (or, in the case of the above        9-silafluorenediyl compounds, additionally a zirconium dimethyl        radical).

Further illustrative and non-limiting examples of metallocene compoundsof the present invention include all of the compounds set forth abovewherein the zirconium atom is replaced by a hafnium atom.

The above names represent the individual stereoisomers as well asmixtures of any ratios thereof. For example,“dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconiumdichloride” representsrac-dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconiumdichloride,meso-dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconiumdichloride and any mixtures of these compounds.

Moreover, the term “biphenylyl” in the above names is synonymous with“phenylphenyl”.

Also, the term “9-silafluorenediyl-” refers to a group of the followingformula:

The metallocenes of this invention may be prepared according to generaltechniques known from the literature. See, for example, U.S. Pat. Nos.5,789,634 and 5,840,644 as well as WO 98/40331, each fully incorporatedherein by reference.

Generally, metallocenes of this type are synthesized as shown below (forR⁴=H) where (a) is an aryl-coupling reaction between a 4-halosubstitutedindene and an aryl Grignard reagent catalyzed by NiCl₂(PPh₃)₂ inether-type solvents at room temperature to reflux. Product is usuallypurified by column chromatography or distillation. (b) is adeprotonation via a metal salt of an alkyl anion (e.g. n-BuLi) to forman indenide followed by reaction with an appropriate bridging precursor(e.g. Me₂SiCl₂). Reactions are usually done in ether-type solvents atambient temperatures. The final product is purified by columnchromatography or distillation; and (c) is double deprotonation via analkyl anion (e.g. n-BuLi) to form a dianion followed by reaction with ametal halide (e.g. ZrCl₄). The reactions are usually done in ether-typeor aromatic solvents at ambient temperatures. The final products areobtained by recrystallization of the crude solids.

An appropriately substituted indene for making the desired bridgedligand can be prepared by methods well known to those skilled in theart. See, for example, U.S. Pat. No. 5,789,634 and WO 98/40331, supra,as well as WO 01/14388, EP-A-0 576 970 and EP-A-0 629 632, all of whichare fully incorporated herein by reference.

The metallocenes of this invention are highly active catalyst componentsfor the polymerization of olefins. They can form different stereoisomersand are preferably employed as chiral racemates. However, it is alsopossible to use the individual enantiomers in the (+) or (−) form. Theindividual stereoisomers allow an optically active polymer to beprepared. In some cases it may be desirable to remove the meso form ofthe metallocenes, since the polymerization-active center (the metalatom) in these compounds is no longer chiral due to the mirror symmetryat the central metal atom and it is, therefore, not possible to producea highly isotactic polymer. If the meso form is not removed, atacticpolymer is formed in addition to isotactic polymer. For certainapplications (e.g., if a random copolymer of propylene and ethyleneand/or any other monoolefin and/or diene is to be made) this may beentirely desirable. Accordingly, racemic metallocenes contaminated withnot more than about 5%, preferably not more than about 2%, and even morepreferred not more than about 1%, of the meso form represent aparticularly preferred embodiment of the metallocenes of the presentinvention. In another preferred embodiment, the meso form of ametallocene of the present invention is contaminated with not more thanabout 5%, preferably not more than about 2%, and even more preferred notmore than about 1%, of the racemic form.

Rac/meso metallocene isomer separation is facilitated when metallocenescontaining certain bridging groups are prepared. This has been found tobe true when the bridging group, R¹³, is represented by the formula:

wherein M² and R¹⁷ to R²⁴ are as defined above.

Metallocenes are generally used in combination with some form ofactivator in order to create an active catalyst system. The terms“activator” and “cocatalyst”, are used interchangeably and are definedherein to mean any compound or component, or combination of compounds orcomponents, capable of enhancing the ability of one or more metallocenesto polymerize olefins.

Alkylalumoxanes such as methylalumoxane (MAO) are commonly used asmetallocene activators. The alumoxanes which may be employed accordingto the present invention are not particularly limited. They includeoligomeric linear and/or cyclic alkylalumoxanes of the general formulaR—(Al(R)—O)_(n)—AlR₂ for oligomeric, linear alumoxanes and(—Al(R)—O—)_(m) for oligomeric cyclic alumoxanes wherein n usually is1–40, preferably 10–20, m usually is 3–40, preferably 3–20, and Rusually is a C₁–C₈ alkyl group (e.g., methyl, ethyl, n-propyl,isopropyl, n-butyl and isobutyl), and preferably methyl to providemethylalumoxane (MAO). MAO is a mixture of oligomers with a very widedistribution of molecular weights and usually with an average molecularweight of about 1200. MAO is typically kept in solution in toluene. Itis also possible to use, for the present purpose, alumoxanes of the typejust described wherein the alkyl groups in the above general formulaeare different. A preferred example thereof is modified methylalumoxane(MMAO) wherein in comparison to MAO a part of the methyl groups isreplaced by other alkyl groups. Alumoxane solutions, particularlymethylalumoxane solutions, may be obtained from commercial vendors assolutions having various concentrations. There are a variety of methodsfor preparing alumoxane, non-limiting examples of which are described inU.S. Pat. Nos. 4,665,208, 4,952,540, 5,091,352, 5,206,199, 5,204,419,4,874,734, 4,924,018, 4,908,463, 4,968,827, 5,308,815, 5,329,032,5,248,801, 5,235,081, 5,103,031, 6,001,766 and EP-A-0 561 476, EP-B1-0279 586, EP-A-0 594-218 and WO 94/10180, each fully incorporated hereinby reference.

Generally the atomic ratio of Al in the alumoxane to metal in themetallocene compound is at least about 10:1, more preferably at leastabout 50:1, and most preferred at least about 80:1. On the other handsaid ratio is generally not higher than about 1,000:1, particularly nothigher than about 500:1, with a ratio of not higher than about 300:1being particularly preferred.

Ionizing activators may also be used to activate metallocenes. Theseactivators are neutral or ionic, or are compounds such astri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, which ionize theneutral metallocene compound. Unlike alumoxane cocatalysts, theseionizing activators can usually be employed in a molar ratio withrespect to the metallocene which is much closer to 1:1 (e.g., less than5:1, less than 2:1, and preferably about 1:1). Such ionizing compoundsmay contain an active proton, or some other cation associated with, butnot coordinated or only loosely coordinated to, the remaining ion of theionizing compound. Combinations of activators may also be used, forexample, alumoxane and ionizing activator combination, see for example,WO 94/07928 (incorporated herein by reference in its entirety).

Descriptions of ionic catalysts for coordination polymerizationcomprised of metallocene cations activated by non-coordinating anionsappear in the early work in EP-A-0 277 003, EP-A-0 277 004 and U.S. Pat.No. 5,198,401 and WO-A-92/00333 (each fully incorporated herein byreference). These teach desirable methods of preparation whereinmetallocenes are protonated by an anion containing or ionic precursorsuch that an alkyl/hydride group is abstracted from a transition metalto make it both cationic and charge-balanced by the non-coordinatinganion. Suitable ionic salts include tetrakis-substituted borate oraluminum salts having fluorinated aryl constituents such as phenyl,biphenyl and naphthyl.

The term “non-coordinating anion” (NCA) means an anion which either doesnot coordinate to said cation or which is only weakly coordinated tosaid cation thereby remaining sufficiently labile to be displaced by aneutral Lewis base. “Compatible” non-coordinating anions are those whichare not degraded to neutrality when the initially formed complexdecomposes. Further, the anion will not transfer an anionic substituentor fragment to the cation so as to cause it to form a neutral fourcoordinate metallocene compound and a neutral by-product from the anion.Non-coordinating anions useful in accordance with this invention arethose which are compatible, stabilize the metallocene cation in thesense of balancing its ionic charge at +1, yet retain sufficientlability to permit displacement by an ethylenically or acetylenicallyunsaturated monomer during polymerization.

The use of ionizing ionic compounds not containing an active proton butcapable of producing both the active metallocene cation and anon-coordinating anion is also known. See, for example, EP-A-0 426 637and EP-A-0 573 403 (each fully incorporated herein by reference). Anadditional method of making the ionic catalysts uses ionizing anionprecursors which are initially neutral Lewis acids but form the cationand anion upon ionizing reaction with the metallocene compounds, forexample the use of tris(pentafluorophenyl)borane. See EP-A-0 520732(incorporated herein by reference in its entirety). Ionic catalysts foraddition polymerization can also be prepared by oxidation of the metalcenters of transition metal compounds by anion precursors containingmetallic oxidizing groups along with the anion groups, see EP-A-0 495375 (fully incorporated herein by reference).

Where the metal ligands include halogen moieties (for example, chloride)which are not capable of ionizing abstraction under standard conditions,they can be converted via known alkylation reactions with organometalliccompounds such as lithium or aluminum hydrides or alkyls,alkylalumoxanes, Grignard reagents, etc. See EP-A-0 500 944 and EP-A1-0570 982 (each fully incorporated herein by reference) for in situprocesses describing the reaction of alkyl aluminum compounds withdihalo-substituted metallocene compounds prior to or with the additionof activating anionic compounds.

Methods for supporting ionic catalysts comprising metallocene cationsand NCAs are described in WO 9950311, U.S. Pat. Nos. 5,643,847,5,972,823, 6,143,686, and 6,228,795 (each fully incorporated herein byreference).

When the activator for the metallocene supported catalyst composition isa NCA, preferably the NCA is first added to the support compositionfollowed by the addition of the metallocene catalyst. When the activatoris MAO, preferably the MAO and metallocene catalyst are dissolvedtogether in solution. The support is then contacted with theMAO/metallocene catalyst solution. Other methods and orders of additionwill be apparent to those skilled in the art.

The catalyst compositions of this invention preferably comprise asupport. Suitable supports include porous particulate materials, such asfor example, talc, inorganic oxides, inorganic chlorides such asmagnesium chloride, and resinous materials such as polyolefins or otherpolymers.

Preferably, the support materials are porous inorganic oxide materials,which include those from the Periodic Table of Elements of Groups 2, 3,4, 5, 13 or 14 metal/metalloid oxides. Silica, alumina, silica-alumina,and mixtures thereof are particularly preferable. Other inorganic oxidesthat may be employed either alone or in combination with the silica,alumina or silica-alumina are magnesia, titania, zirconia, and the like.

In one preferred embodiment the support material is porous silica, morepreferably porous silica which has a surface area in the range of notless than 10, preferably not less than 50, and most preferred not lessthan 100 m²/g , but usually not more than 700, preferably not more than500, and most preferred not more than 400 m²/g. The total pore volumethereof usually is not less than 0.1, preferably not less than 0.5, andmost preferred not less than 0.8 cc/g, whereas the pore volume generallyis not higher than 4.0, preferably not higher than 3.5, most preferrednot higher than 3.0 cc/g. The average particle size of the porous silicashould be at least 10, preferably at least 20, and most preferred atleast 30 μm, the maximum value thereof usually being not higher than500, preferably not higher than 200, and most preferred not higher than100 μm. The average pore size of typical porous support materialsusually is at least 10, preferably at least 50, and even more preferablyat least 75 Å. Average pore sizes should generally not be higher than1000, preferably not higher than 500, and most preferred not higher than350 Å. It may be particularly desirable to dehydrate the silica at atemperature of from 100° C. to 800° C. anywhere from 3 to 24 hours.

The metallocene, activator and support material may be combined in anynumber of ways. More than one metallocene may also be used. Examples ofsuitable support techniques are described in U.S. Pat. Nos. 4,808,561and 4,701,432 (each fully incorporated herein by reference). Preferablymetallocene and activator are combined and their contact product issupported on the porous support material as described in U.S. Pat. No.5,240,894 and WO 94/28034, WO 96/00243, and WO 96/00245 (each fullyincorporated herein by reference). Alternatively, the metallocenes maybe preactivated separately and then combined with the support materialeither separately or together. If the metallocenes are separatelysupported, then preferably, they are dried and then combined as a powderbefore use in polymerization.

Regardless of whether the metallocene(s) and their activator areseparately precontacted or whether the metallocene(s) and activator arecombined at once, in some instances it may be preferred that the totalvolume of reaction solution applied to the porous support is less than 4times the total pore volume of the porous support, more preferably lessthan 3 times the total pore volume of the porous support and even morepreferably in the range of from more than 1 to less than 2.5 times thetotal pore volume of the porous support. Procedures for measuring thetotal pore volume of porous support are well known in the art. One suchmethod is described in Volume 1, Experimental Methods in CatalystResearch, Academic Press, 1968, pages 67–96, fully incorporated hereinby reference.

The supported catalyst system may be used directly in polymerization orthe catalyst system may be prepolymerized using methods well known inthe art. For details regarding prepolymerization, see U.S. Pat. Nos.4,923,833 and 4,921,825, and EP 0 279 863 and EP 0 354 893 (each fullyincorporated herein by reference).

The metallocene catalyst systems described herein are useful in thepolymerization of all types of olefins. This includes polymerizationprocesses which produce homopolymers, copolymers, terpolymers and thelike as well as block copolymers and impact copolymers. Thesepolymerization processes may be carried out in solution, in suspensionor in the gas phase, continuously or batchwise, or any combinationthereof, in one or more steps, usually at a temperature not lower than30, preferably not lower than 50, most preferred not lower than 80° C.,and not higher than 200, preferably not higher than 120, most preferrednot higher than 100° C. Preferably, the polymerization orcopolymerization is carried out using olefins of the formulaR^(a)—CH═CH—R^(b). In this formula, R^(a) and R^(b) are identical ordifferent and are a hydrogen atom or an alkyl or alkenyl radical having1 to 14 carbon atoms. Alternatively, R^(a) and R^(b) may form a ringtogether with the carbon atoms connecting them. Examples of such olefinsare ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and1-octene, vinylcyclohexane, norbornene and norbornadiene. In particular,propylene and ethylene are polymerized. The metallocenes andmetallocenes catalyst systems of this invention are most suitable forthe polymerization of propylene based polymers.

If necessary, hydrogen is added as a molecular-weight regulator and/orin order to increase the activity. The overall pressure in thepolymerization system usually is at least about 0.5 bar, preferably atleast about 2 bar, most preferred at least about 5 bar. Pressures higherthan about 100, e.g., higher than about 80 bar and, in particular,higher than about 64 bar are usually not preferred.

Typically, the metallocene is used in the polymerization in aconcentration, based on the transition metal, of not less 10⁻⁴,preferably not less than 10⁻³ mol, and not higher than 10⁷, preferablynot higher than 10⁴ mol, of transition metal per dm³ of solvent or perdm³ of reactor volume. When alumoxane is used as the cocatalyst, it isused in a concentration of usually not less than 10⁻⁴, preferably notless than 10⁻⁵ mol, and not higher than 10⁻¹, preferably not higher than10⁻² mol, per dm³ of solvent or per dm³ of reactor volume. The othercocatalysts mentioned are used in an approximately equimolar amount(e.g., from about 1.2:1 to about 1:1.2) with respect to the metallocene.In principle, however, higher concentrations are also possible.

If the polymerization is carried out as a suspension or solutionpolymerization, an inert solvent which is customary for the Zieglerlow-pressure process is typically used for example, the polymerizationis carried out in an aliphatic or cycloaliphatic hydrocarbon; examplesof which are propane, butane, hexane, heptane, isooctane, cyclohexaneand methylcyclohexane. It is also possible to use mineral spirit or ahydrogenated diesel oil fraction. Toluene can also be used. Thepolymerization is preferably carried out in the liquid monomer(s). Ifinert solvents are used, the monomer(s) is (are) metered in gas orliquid form.

Before addition of the catalyst, in particular of the supported catalystsystem, another alkylaluminum compound, such as, for example,trimethylaluminum, triethylaluminum, triisobutylaluminum,trioctylaluminum or isoprenylaluminum, may additionally be introducedinto the reactor in order to render the polymerization system inert (forexample to remove catalyst poisons present in the olefin). This compoundis added to the polymerization system in a concentration of from 100 to0.01 mmol of Al per kg of reactor contents. Preference is given totriisobutylaluminum and triethylaluminum in a concentration of from 10to 0.1 mmol of Al per kg of reactor contents. This allows the molarAl/M¹ ratio to be selected at a low level in the synthesis of asupported catalyst system.

In principle, however, the use of further substances for catalysis ofthe polymerization reaction is unnecessary, i.e., the systems accordingto the invention can be used as the only catalysts for thepolymerization of olefins.

The process according to the invention is distinguished by the fact thatthe metallocenes described can give propylene polymers of very highmolecular weight, melting point, and very high stereotacticity, withhigh catalyst activities in, e.g., the temperature range from about 40°C. to about 100° C., such as the industrially particularly interestingpolymerization temperature range of from about 50° C. to about 80° C.

The catalyst systems of this invention are capable of providingpolymers, particularly propylene homopolymers and copolymers, ofexceptionally high molecular weight and melting point even when used inprocesses under commercially relevant conditions of temperature,pressure and catalyst activity. Preferred melting points of olefinpolymers comprising at least about 99% by weight, preferably are atleast about 99.3% by weight and most preferred at least 99.5% by weightof units derived from propylene (the remainder being preferably derivedfrom one or more compounds selected from ethylene and 1-olefinscomprising 4 to 12 carbon atoms, most preferred ethylene) are as high as155° C., e.g., as high as 156° C., more preferably at least 157° C.,even more preferably at least 158° C., and may be as high as 160° C. oreven higher (these melting points being determined by DSC according tothe procedure described in the Examples below).

With respect to molecular weights, copolymers made with the catalystsystems of the present invention such as, e.g., ethylene/propylenerubbers (EPR's) or ethylene/propylene/diene copolymers (EPDM's), usuallyhave an intrinsic viscosity, measured in decalin at 135° C., of usuallyat least about 1.8, preferably at least about 2.0, and more preferred atleast about 2.1 (e.g., at least about 2.2). This enables the productionof very satisfactory impact copolymers (ICP's), such as in situ blendsof propylene homopolymer or copolymer as discussed above of high meltingpoint (and preferably also high molecular weight) and propylenecopolymers (such as EPR's and/or EPDM's) of high intrinsic viscositywith a single catalyst system (and, preferably, in a single reactor).For this purpose, the copolymers generally will have an ethylene contentof at least about 30, preferably at least about 35, more preferred atleast about 40 weight % and not more than about 60, preferably not morethan about 50 weight %. The ethylene content of the ICP's usually willbe at least about 1.5, preferably at least about 3 weight percent and upto about 20, preferably up to about 15, weight %.

The homo- and copolymers made with the catalyst systems of the presentinvention (e.g., those containing units derived from propylene, or frompropylene and ethylene) also have a narrow molecular weightdistribution, M_(w)/M_(n), usually of not higher than about 3.5,preferably not higher than about 3.0, more preferred not higher thanabout 2.5 and sometimes even not higher than about 2.2. They also aredistinguished by low xylene and n-hexane extractables contents. Oftenthe xylene extractables and/or the n-hexane extractables of these homo-and copolymers will amount to less than about 2.0, preferably less thanabout 1.5, even more preferred less than about 1.0 weight %. A generaldescription of the procedure for measuring the xylene extractables(solubles) is found in J. C. Randall, J. Poly. Sci.: Part A PolymerChemistry, Vol. 36, 1527–1542 (1998), incorporated herein by referencein its entirety. Hexane extractions are performed by weighing thepolymer sample in a dried soxhlet thimble. Hexane is heated to refluxthrough the thimble in the soxhlet apparatus. When the extraction iscomplete the solvent is evaporated, and the sample dried under theappropriate vacuum. The amount of extractables is determined by weight.The thimble containing the insoluble polymer is dried in a vacuum ovenand the weight of the recovered polymer is determined.

The polymer compositions made in accordance with the present inventionare also characterized by a relatively narrow molecular weightdistribution. Their values of M_(w)/M_(n) (as determined by GelPermeation Chromatography using polystyrene standards, see Examplesbelow) usually are not higher than about 3.5, often not higher thanabout 3.0, e.g., not higher than about 2.7.

Catalyst systems of this invention are capable of providing propylenepolymers having high stereospecificity and regiospecificity. Isotacticpropylene polymers prepared according to the processes of this inventionmay have a proportion of 2,1-inserted propene units of less than about0.5%, at a triad tacticity of greater than about 98%. Preferably, thereis no measurable proportion of 2,1-inserted propene units. Triadtacticity is determined using ¹³C-NMR according to J. C. Randall,Polymer Sequence Determination: Carbon-13 NMR Method, Academic Press NewYork 1978, incorporated herein by reference in its entirety.

Polymers prepared using the processes described herein find uses in allapplications including fibers, injection-molded parts, films, pipes, andwire and cable applications. Non-limiting examples include carpet fibersand primary and secondary carpet backing; slit tape applications such astarpaulins, erosion abatement screens, sand bags, fertilizer and feedbags, swimming pool covers, intermediate bulk container (IBC) bags;non-woven applications for spunbonded, melt blown and thermobondedcarded web applications such as disposable diaper liners, femininehygiene products, tarpaulins and tent fabrics, and hospital garments;apparel applications such as socks, T-shirts, undergarments, bicycleshorts, sweat bands, football undershirts, hiking socks and otheroutdoor sporting apparel; cordage applications such as mooring andtowing lines and rope applications; netting applications such as safetyfences, geogrids for soil stabilization; injection molded applicationssuch as appliance parts in automatic dishwashers and clothes washers,hand tools and kitchen appliances; consumer product applications such asoutdoor furniture, luggage, infant car seats, ice coolers, yardequipment; medical applications such as disposable syringes and otherhospital and laboratory devices; rigid packaging made by injectionmolding, blow molding or thermoforming such as margarine tubs, yogurtcontainers and closures, commercial bottles and ready-to-eat foodcontainers; transportation applications such as automotive interiortrim, instrument panels, bumper fascia, grills and external trim parts,battery cases; film applications such as snack packages and other foodpackaging and film labels, packing tapes and pressure sensitive labels;wire and cable applications such as wire insulation.

While the present invention has been described and illustrated byreference to particular embodiments, it will be appreciated by those ofordinary skill in the art, that the invention lends itself to manydifferent variations not illustrated herein. For these reasons, then,reference should be made solely to the appended claims for purposes ofdetermining the true scope of the present invention.

Although the appendant claims have single appendencies in accordancewith U.S. patent practice, each of the features in any of the appendantclaims can be combined with each of the features of other appendantclaims or the main claim.

EXAMPLES

All air sensitive experiments are carried out in nitrogen purged dryboxes. All reagents, and solvents were purchased from commercialsources. Aluminium alkyls were purchased as hydrocarbon solutions fromcommercial sources. The commercial methylalumoxane (“MAO”) was purchasedfrom Albemarle as a 30 wt % solution in toluene. Racemicdimethylsilanediylbis(2-methyl-4-phenyl-indenyl)zirconium dichloride wasobtained from commercial sources and used as received.

I. 4-Bromo-2,5 Dimethylindene Synthesis (a) 2-(Bromomethyl)-6-methylbromobenzene

A procedure similar to that described in Bull. Chem. Soc. Japan, 59,3285–3286 (1986), fully incorporated herein by reference, was used. In atwo liter round bottom flask equipped with an overhead stirrer andheating mantle was placed 2-bromo-meta-xylene (60.08 g, 0.325 mol) andcarbon tetrachloride (650 ml). To this were added N-bromosuccinimide(57.78 g, 0.325 mol) and an additional 550 ml carbon tetrachloride.After stirring fifteen minutes benzoyl peroxide (0.72 g, 2.9 mmol, 0.9mole %) was added, and the mixture was heated to reflux. After fourhours the reaction was cooled, and the carbon tetrachloride was removed.The residue was taken up in 10% methylene chloride in n-hexane (600 ml)and filtered through silica (250 g). The filter cake was washed with anadditional 400 ml of the in 10% methylene chloride in n-hexane. Thefiltrate was evaporated to give a clear liquid (74.22 g, 51% conversionby NMR). Vacuum distillation produced a fraction distilling at 72°C.–80° C. at 0.1 Torr as a water white liquid (40.62 g, 47% yield). NMR(CD₂Cl₂). 7.2 (m, 3H), 4.62 (s, 2H), 2.4 (s, 3H). Elemental analysis: C,36.18%; H, 3.12%; Br, 61.14%; (theory: C, 36.40%; H, 3.06%; Br, 60.54%).

(b) 4-Bromo-2,5-dimethylindene

In a 500 ml round bottom flask was placed sodium hydride (95%, 3.83 g,0.1516 mol) and THF (100 ml, anhydrous). After equipping the flask withan overhead stirrer the resultant slurry was cooled to 5° C. In anaddition funnel was placed diethyl methylmalonate (26.44 g, 0.1518 mol,previously dried over 3A sieves). This was added dropwise over thirtyminutes to the sodium hydride slurry while maintaining the temperaturebelow 10° C. After the addition the bath was removed and stirringcontinued for two hours. The reaction was recooled to 5° C. In anaddition funnel was placed 2-(bromomethyl)-6-methyl bromobenzene (39.64g, 0.150 mol), prepared as described under (a) above, and added dropwiseover one hour while maintaining the temperature below 5° C. The bath wasthen removed and the stirring continued overnight. Thereafter, asolution of sodium hydroxide in water (30 ml of 15 g NaOH in 30 mlwater) was added and the resultant mixture was stirred for five minutes.Then water (80 ml) was added. The resultant white slurry was heated todistill the THF (60–65° C.). Heating was continued until an internaltemperature of 100–110° C. was reached and water (25 ml) was added.After 45 minutes the distillation of THF was complete. The reactionmixture was cooled and then poured rapidly with stirring intoconcentrated HCl (80 ml) and water (80 ml), affording a whiteprecipitate. This was collected on a coarse frit funnel and washed threetimes (25 ml each time) with water. The solid was dried on the fritunder vacuum and then dried at ambient temperature in a nitrogen flowfor three days to give the diacid solid (45.17 g, 0.150 mol, 95%). Thiswas placed in a 500 ml flask and heated over several hours to 150–155°C. at which the solid melted and gas evolution became rapid. After onehour the gas (CO₂) evolution stopped. The flask was cooled to 70° C. andheptane (100 ml) added. After heating to 80° C. the solids went intosolution. The solution was cooled to 45° C. and thionyl chloride (20 ml,0.255 mol, ca. 70% excess) was added dropwise over fifteen minutes. Theresultant mixture was heated to 60–70° C. for 140 minutes. The flask wasequipped with a distillation head, heated to 120–130° C. to distill offexcess thionyl chloride and n-heptane and then cooled. Methylenechloride (100 ml) was added and the flask cooled to 5° C., whereafteraluminum trichloride (30 g) was added slowly in 10 g portions. Thetemperature rose to about 10–15° C. and the mixture was stirred fifteenminutes and then an additional fifteen minutes at 0–5° C. The coolingbath was removed and the contents of the flask stirred for two hours atroom temperature. The resultant mixture was cautiously poured onto ice(120 g) with stirring and then stirred one hour. The organic (methylenechloride) layer that had formed was separated and the aqueous layerextracted with methylene chloride. The combined organic portions werewashed with water (100 ml, twice), 5% sodium bicarbonate (100 ml, twice)and saturated NaCl solution (250 ml) and then dried over sodiumcarbonate with stirring. Filtering and evaporation of the solvent gavethe corresponding ketone (18.7 g, 52% overall). This was placed in a 250ml round bottom flask, dissolved with methanol (50 ml) and cooled to 10°C. In a second flask a slurry of NaBH₄ (3.19 g, 0.084 mol) in methanol(25 ml) containing sodium methoxide (50 mg) was prepared and slowlyadded to the solution of the ketone at <10° C. After stirring one hourat 10° C. an additional 50 ml methanol was added and then stirredovernight at room temperature. Thereafter water (75 ml) was added withstirring. The mixture was extracted with methylene chloride (3 times,150 ml each) and then volatile organic materials were evaporated to givea white solid (19.28 g). The solid was placed in a three neck flask,followed by toluene (125 ml) and p-toluene sulfonic acid (0.13 g). Thismixture was heated to reflux, and the water removed through a Dean-Starktrap over four hours. After cooling a 5% NaHCO₃ solution was added alongwith diethyl ether (50 ml). The aqueous layer was extracted withadditional ether. The organic portions were combined, dried over sodiumsulfate, filtered and evaporated with a flow of nitrogen overnight.These resulting crystals were dried under vacuum for two hours to givebeige crystals (15.90 g, 48% overall yield from dibromide). NMR (CD₂Cl₂)7.1 (s, 2H), 6.5 (s, 1H), 3.3 (s, 2H), 2.4 and 2.15 (both s, 6H).Elemental analysis: C, 58.84%; H, 5.09%; Br, 35.65%; (theory: C, 59.22%;H, 4.97%; Br, 35.81%).

II. Metallocene Synthesis A.Dimethylsilanediylbis[2,5-dimethyl-4-phenylindenyl]zirconium dichloride(a) 2,5-Dimethyl-4-phenylindene

4-Bromo-2,5-dimethylindene (9.0 g, 40 mmol), prepared as described underI.(b) above, and NiCl₂(PPh₃)₂ (1.8 g, 2.8 mmol) were dissolved in 300 mlof diethyl ether (Et₂O). Phenylmagnesium bromide, 3.0 M in Et₂O, (13.5ml, 40 mmol) was added under vigorous stirring and the reaction stirredovernight at reflux. The resultant reaction was slowly quenched with H₂Oto neutralize unreacted Grignard reagent, subsequently treated with 100ml of 10% HCl(aq), and neutralized with saturated sodium bicarbonateaqueous solution. The resultant organic layer was dried with magnesiumsulfate, and the solvent was removed by rotary evaporation. Theremaining residue was loaded onto a silica gel column and eluted withhexane. Yield is 1.3 g (15%).

(b) Lithium[2,5-dimethyl-4-phenylindenide]

2,5-Dimethyl-4-phenylindene (1.3 g, 5.9 mmol), prepared as describedunder (a) above, was dissolved in 100 ml of pentane. To this solutionwas added 2.4 ml of nBuLi (n-butyl lithium, 2.5 M in hexane) and thereaction was stirred five hours at room temperature. A yellow-whitesolid precipitated from solution and was collected by frit filtrationand washed with additional pentane. Yield: 1.2 g (98%).

(c)Dimethylsilanediylbis[2,5-dimethyl-4-phenylindene]

Dichlorodimethylsilane (0.35 g, 2.8 mmol) was dissolved in 30 ml of THF.While stirring, lithium[2,5-dimethyl-4-phenylindenide] (1.2 g, 5.5mmol), prepared as described under (b) above, was added thereto as a drypowder and the resultant mixture was stirred at reflux for three hours.Thereafter the solvent was removed in vacuo and the residue was taken upin pentane and filtered to remove LiCl. The pentane was removed invacuo, and the crude product was isolated. Yield: 1.3 g (100%).

(d) Dimethylsilanediylbis[2,5-dimethyl-4-phenylindenyl]zirconiumdichloride

Dimethylsilanediylbis[2,5-dimethyl-4-phenylindene] (1.3 g, 2.8 mmol),prepared as described under (c) above, was dissolved in 50 ml of Et₂O.While stirring, 2.2 ml of nBuLi (2.5 M in hexane) was added, followed bystirring at room temperature for one hour. After this time, the solutionwas cooled to −35° C. and ZrCl₄ (0.63 g, 2.8 mmol) was added, followedby stirring at room temperature for three hours. Thereafter the solventwas removed in vacuo and the residue was taken up in toluene andfiltered to remove LiCl. The filtrate was then concentrated and chilledto −35° C. to induce crystallization. 90 mg (5.1%) of pure racemiccompound was obtained.

B.Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]zirconiumdichloride (e) 3,5-Dimethylphenylboronic acid

3,5-Dimethylbromobenzene (10 g, 54 mmol) and magnesium (2.5 g, 108 mmol)were dissolved in 100 mL of THF and stirred at reflux for five hours.After this time, triisopropylborate (10 g, 54 mmol) as a solution indiethylether (50 mL) was added to the solution, followed by stirring atroom temperature overnight. The THF was removed in vacuo to leave acrude oil. This oil was taken up in 100 mL of diethylether and 100 mL of10% sulfuric acid (aqueous) and stirred for two hours. The organic layerwas separated and neutralized with saturated sodium bicarbonatesolution, whereafter the solvent was removed in vacuo to yield a whitesolid. The solid was washed generously with pentane. Yield: 4.0 g (49%).

(f) 2,5-Dimethyl-4-(3,5-dimethylphenyl)indene

3,5-Dimethylphenylboronic acid (2.3 g, 15 mmol), prepared as describedunder (e) above, cesium carbonate (4.9 g, 15 mmol), and Pd₂(dba)₃ (87mg, 94 μmol) (dba=dibenzylidene acetone) were dissolved in 30 ml of1,4-dioxane. To the resultant solution were added P(t-Bu)₃ (57 μL, 280μmol) and 4-bromo-2,5-dimethylindene (3.1 g, 15 mmol) and the reactionwas stirred at 80° C. for five hours. After this time, the solvent wasremoved in vacuo and the residue was taken up in 100 ml of diethyl etherand filtered through a celite-packed frit to remove cesium salts.Thereafter the solvent was removed in vacuo and the residue was loadedonto a silica gel column and eluted with hexane. Yield: 2.1 g (56%).

(g) Lithium[2,5-dimethyl-4-(3,5-dimethylphenyl)indenide]

2,5-Dimethyl-4-(3,5-dimethylphenyl)indene (2.1 g, 8.4 mmol), prepared asdescribed under (f) above, was dissolved in 60 ml of pentane. To thissolution was added 3.4 ml of nBuLi (2.5 M in hexane) and the reactionwas stirred for two hours at room temperature. A white solidprecipitated from solution and was collected by frit filtration andwashed with additional pentane. Yield: 1.6 g (74%).

(h) Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indene]

Dichlorodimethylsilane (0.40 g, 3.1 mmol) was dissolved in 40 ml of THF.While stirring, lithium[2,5-dimethyl-4-(3,5-dimethylphenyl)indenide](1.6 g, 6.2 mmol), prepared as described under (g) above, was added as adry powder and the resultant mixture was stirred overnight at roomtemperature. Thereafter the solvent was removed in vacuo and the residuewas taken up in pentane and filtered to remove LiCl. The pentane wasremoved in vacuo to yield a flaky white solid (1.7 g, 100%).

(i)Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]zirconiumdichloride

Dimethylsilanedlylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indene] (1.7 g,3.1 mmol), prepared as described under (h) above, was dissolved in 50 mlof Et₂O. While stirring, 2.5 ml of nBuLi (2.5 M in hexane) was added,followed by stirring at room temperature for two hours. After this time,the solution was cooled to −35° C. and ZrCl₄ (0.71 g, 3.1 mmol) wasadded, followed by stirring at room temperature for 3 hours. The solventwas then removed in vacuo and the residue was taken up in a mixture ofmethylene chloride and pentane and filtered to remove LiCl. The filtratewas then concentrated and chilled to −35° C. to induce crystallization.0.18 g (8.0%) of pure racemic compound was obtained.

C.Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indenyl]zirconiumdichloride (j) 3,5-Di-t-butylphenylboronic acid

3,5-Di-t-butylbromobenzene (10 g, 37 mmol) and magnesium (1.8 g, 75mmol) were dissolved in 100 mL of THF and stirred at reflux for fivehours. After this time, triisopropylborate (7.0 g, 37 mmol) as asolution in diethylether (50 mL) was added to the solution, followed bystirring at room temperature overnight. Then the THF was removed invacuo to leave a crude oil. This oil was taken up in 100 mL ofdiethylether and 100 mL of 10% sulfuric acid (aqueous) and stirred fortwo hours. The organic layer was separated and neutralized withsaturated sodium bicarbonate solution, whereafter the solvent wasremoved in vacuo to yield a white solid. The solid is washed generouslywith pentane. Yield: 3.0 g (34%).

(k) 2,5-Dimethyl-4-(3,5-di-t-butylphenyl)indene

3,5-Di-t-butylphenylboronic acid (4.4 g, 19 mmol), prepared as describedunder (j) above, cesium carbonate (7.3 g, 22 mmol), and Pd₂(dba)₃ (0.24g, 262 μmol) (dba=dibenzylidene acetone) were dissolved in 60 ml of1,4-dioxane. To this solution were added P(t-Bu)₃ (170 μL, 830 μmol) and4-bromo-2,5-dimethylindene (3.1 g, 19 mmol), followed by stirring at 80°C. for five hours. After this time, the solvent was removed in vacuo andthe residue was taken up in 150 ml of diethyl ether and filtered througha celite-packed frit to remove cesium salts. Then the solvent wasremoved in vacuo and the residue was loaded onto a silica gel column andeluted with hexane. Yield: 3.4 g (54%).

(l) Lithium[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indenide]

2,5-Dimethyl-4-(3,5-di-t-butylphenyl)indene (3.4 g, 10 mmol), preparedas described above under (k), was dissolved in 200 ml of pentane. To thesolution was added 4.1 ml of nBuLi (2.5 M in hexane), followed bystirring for four hours at room temperature. A white solid precipitatedfrom solution and was collected by frit filtration and washed withadditional pentane. Yield: 3.0 g (88%).

(m) Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indene]

Dichlorodimethylsilane (0.57 g, 4.4 mmol) was dissolved in 40 ml ofEt₂O. While stirring,lithium[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indenide] (3.0 g, 8.8mmol), prepared as described under (l) above, was added as a dry powder,followed by 5 ml of THF. The resultant mixture was stirred overnight atroom temperature, whereafter the solvent was removed in vacuo and theresidue was taken up in Et₂O and filtered to remove LiCl. Then the Et₂Owas removed in vacuo and the remaining oil was loaded onto a silica gelcolumn and eluted with hexane. Yield: 3.1 g (97%).

(n)Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indenyl]zirconiumdichloride

Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indene] (3.1g, 4.3 mmol), prepared as described under (m) above, was dissolved in 50ml of Et₂O. While stirring, 3.4 ml of nBuLi (2.5 M in hexane) was added,followed by stirring at room temperature for 0.5 hour. After this time,the solution was cooled to −35° C. and ZrCl₄ (1.0 g, 4.3 mmol) wasadded. After stirring at room temperature for one hour, the resultantsolution was filtered through a celite frit to remove LiCl. Thereafterthe solvent was removed in vacuo and the resultant crude solid wasdissolved in pentane, followed by cooling to induce crystallization. Thepure racemic isomer was collected as yellow crystals. Yield: 700 mg(18%).

III. Supported Catalyst Composition Synthesis A. Supported MetalloceneCatalyst Composition A

In a 100 mL round bottom flaskdimethylsilanediylbis[2,5-dimethyl-4-phenylindenyl]zirconium dichloride(0.058 g), prepared as described under II.A. above, was added to theabove MAO-toluene solution (6.74 g, 7.15 ml) and stirred for twentyminutes. The resultant mixture was filtered through a medium glass fritfunnel and washed with toluene (14 mL). To the combined filtrates wasadded dehydrated silica (4.0 g, Davison 948 Regular, 600° C.dehydration) and the resultant slurry was stirred for twenty minutes,then dried at 40° C. for two minutes under vacuum on a rotary evaporatoruntil the liquid had evaporated. Then the solid was further dried atotal of about two hours and 23 minutes. The supported catalystcomposition was recovered as a pink-orange, free flowing solid (5.64 g).

Polymerization results are summarized in Tables 2A and 2B below. Forcomparison purposes, Tables 1A and 1B below summarize the resultsobtained with the corresponding metallocene wherein the methyl group inthe 5-position of the indene ring is replaced by a hydrogen atom, i.e.,dimethylsilanediylbis[1-(2-methyl-4-phenylindenyl)]zirconium dichloride.

B. Supported Metallocene Catalyst Composition B

In a 100 ml round bottom flaskdimethylsilanediylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]zirconiumdichloride (0.063 g), prepared as described under II.B. above, was addedto the above MAO-toluene solution (6.74 g) and stirred for twentyminutes. The resultant mixture was filtered through a medium glass fritfunnel and washed with toluene (14 ml). To the combined filtrates wasadded dehydrated silica (4.0 g, Davison 948 Regular, 600° C.dehydration) and the resultant slurry was stirred for twenty minutes,then dried at 40° C. for two minutes under vacuum on a rotary evaporatoruntil the liquid had evaporated. Then the solid was further dried atotal of about two hours and 31 minutes. The supported catalystcomposition was recovered as a pink-orange, free flowing solid (5.60 g).

Polymerization results are summarized in Tables 3A and 3B below.

C. Supported Metallocene Catalyst Composition C

In a 100 ml round bottom flaskdimethylsilanediylbis[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]zirconiumdichloride (0.078 g), prepared as described under II.C. above, was addedto the above MAO-toluene solution (6.74 g, 7.3 ml) and stirred fortwenty minutes. The resultant mixture was filtered through a mediumglass frit funnel and washed with toluene (14 ml). To the combinedfiltrates was added dehydrated silica (4.0 g, Davison 948 Regular, 600°C. dehydration) and the resultant slurry was stirred for twenty minutes,then dried at 40° C. for two minutes under vacuum on a rotary evaporatoruntil the liquid had evaporated. Then the solid was further dried atotal of about two hours and 27 minutes. The supported catalystcomposition was recovered as a pink-orange, free flowing solid (5.75 g).

Polymerization results are summarized in Tables 4A and 4B below.

IV. Polymerizations A. Isotactic Polypropylene Homopolymer

The polymerization procedure for producing propylene homopolymers withthe supported catalyst compositions described above was as follows. In aclean, dry two liter autoclave which had been flushed with propylenevapor, TEAL (triethylaluminum) scavenger (0.3 mL, 1.5M) was placed.Hydrogen gas was added at this point. The reactor was closed and filledwith 800 mL liquid propylene. After heating the reactor to 70° C.,supported catalyst composition was added by washing in with propylene(200 mL). After the indicated time, typically one-hour, the reactor wascooled, and the excess propylene vented. Thereafter the polymer wasremoved and dried.

B. Isotactic Ethylene-Propylene Random Copolymer (RCP)

The polymerization procedure for producing ethylene-propylene randomcopolymers (RCP) with the above supported catalyst compositions was asfollows. In a clean, dry two liter autoclave which had been flushed withpropylene vapor, TEAL scavenger (0.3 mL, 1.5M) was placed. Hydrogen gaswas added at this point, if used. The reactor was closed and filled with800 mL liquid propylene. After heating the reactor to 60° C., anoverpressure of ethylene, as indicated by the “delta kPa”, was slowlyadded while maintaining 60° C. The ethylene inlet was closed while thecatalyst composition was added by washing in with propylene (200 mL).Immediately after addition the ethylene inlet was reopened and thedesired overpressure of ethylene was maintained. After the indicatedtime, typically one-hour, the reactor was cooled, and the excesspropylene vented. Then the polymer was removed and dried.

C. Impact Copolymers (ICP)

The polymerization procedure for producing ICP with one above supportedcatalyst compositions was as follows. In a clean, dry two literautoclave which had been flushed with propylene vapor, TEAL scavenger(0.3 mL, 1.5M) was placed. Hydrogen gas was added at this point. Thereactor was closed and filled with 800 mL liquid propylene. Afterheating the reactor to 70° C., catalyst composition was added by washingin with propylene (200 mL). After the indicated time, typically onehour, the reactor was vented to about 170 psig (1172 kPa) pressure andthen an ethylene/propylene gas mixture was passed through the reactor atthe rates indicated while maintaining a pressure of 200 psig (1379 kPa).At the end of the gas phase stage, typically 90 to 150 minutes, thereactor was vented and cooled under N₂. Then the granular ICP polymerwas removed and dried.

V. Polymer Analysis A. Molecular Weights

Molecular weight determinations were made by gel permeationchromatography (GPC) according to the following technique. Molecularweights and molecular weight distributions were measured using a Waters150° C. gel permeation chromatography equipped with Shodex (Showa Denko)AT-80 M/S columns and a differential refractive index (DRI) detectoroperating at 145° C. with 1,2,4-trichlorobenzene as the mobile phase ata 1.0 mL/min. flow rate. The sample injection volume was 300microliters. The columns were calibrated using narrow polystyrenestandards to generate a universal calibration curve. The polypropylenecalibration curve was established using k=8.33×10⁻⁵ and a=0.800 as theMark-Houwink coefficients. The numerical analyses were performed usingWaters “Millennium” software.

B. Melting Points

DSC melting points were determined on commercial DSC instruments and arereported as the second melting point. The polymer sample was heated to230.0° C. for ten minutes and then cooled from 230° C. to 50° C. at 10°C./minute. The sample was held at 50° C. for five minutes. The secondmelting point was then recorded as the sample was heated from 50° C. to200° C. at a rate of 10° C./minute. The peak temperature was recorded asthe second melting point.

C. ICP Polymer Extraction Method

The ICP polymer was dissolved in hot xylene and then allowed to coolovernight. After filtration the insolubles were dried. The xylenesoluble portion was evaporated and the soluble material recovered. TheIV (intrinsic viscosity) of the recovered soluble material was measuredin decalin at 135° C. by using known methods and instruments such as aSchott A VSPro Viscosity Automatic Sampler.

At very high ICP MFR (melt flow ratio) this method can extract some lowmolecular weight isotactic polypropylene and thus lower the observed IV.

D. ICP Polymer Fractionation Method

The ICP samples were sent to Polyhedron Laboratories, Inc. to befractionated and analyzed by GPC. A general description of the procedureis found in the reference J. C. Randall, J. Poly. Sci.: Part A PolymerChemistry, Vol. 36, 1527–1542 (1998), supra.

VI. Results

As can be seen from the results summarized in the above Tables, incomparison to, the prior art (Tables 1A and 1B) the metallocene catalystcompositions of the present invention afford both propylene homopolymersand ethylene-propylene copolymers of considerably improved molecularweight.

TABLE 1A Dimethylsilanediylbis{1-[2-methyl-4-phenylindenyl]}zirconiumdichloride Cat. C₂= Time C₂=/C₃= TEMP. Amount Yield Efficiency (delta H₂split flow rates RUN # (° C.) (mg) (g) (Kg/g cat) kPa) (mmole) (min.)(l/min.) 1 60 67 274.7 4.10 0 0 60 — 2 60 45 71.7 1.59 0 0 60 — 3 60 40134.1 3.35 68.9 0 60 — 4 60 42 221.5 5.27 137.9 0 60 — 5 60 30 121.34.04 379.2 0 60 — 6 60 30 130.2 4.34 482.6 0 60 — 7 60 30 101.8 3.39137.9 0 60 — 8 70 45 293.5 6.52 — 77.5 60 — 9 70 31 198.9 6.42 — 77.5 60— 10 70 30 291.9 9.73 — 77.5  60/150 4.0/1.0 11 70 30 231.3 7.71 — 77.560/90 4.0/1.0 12 70 30 224.8 7.49 — 77.5 60/90 4.1/0.9 13 70 30 209.97.00 — 77.5 60/90 3.6/1.4 14 70 30 208.2 6.94 — 77.5 60/90 4.0/1.0

TABLE 1B Dimethylsilanediylbis{1-[2-methyl-4-phenylindenyl]}zirconiumdichloride Total IV of Total Ethylene Ethylene in Rubber Final MFRMelting point MW Copolymer RUN # (wt %) Rubber (wt %) (wt %) (g/10 min.)(° C.) (×10⁻³) MWD (dl/g) 1 — — — 0.16 149.2 600.0 2.00 — 2 — — — 0.54148.2 664.9 1.92 — 3 0.67 — — 0.84 142.0 349.0 2.09 — 4 1.28 — — 2.57138.4 280.0 1.95 — 5 3.77 — — 6.48 121.4 255.0 2.04 — 6 4.43 — — 5.95116.0 301.0 2.30 — 7 1.44 — — 2.05 137.5 330.4 2.23 — 8 — — — 99.6 150.3120.6 3.01 — 9 — — — 58.95 150.9 135.7 3.15 — 10 13.23 49.20 26.89 178.5151.2 81.2 3.37 0.7520 11 7.58 47.37 16.00 134.05 150.6 98.4 3.25 0.68712 7.82 50.04 15.63 127.16 150.0 100.4 3.11 0.708 13 5.3 38.96 13.60201.9 150.43 91.2 3.28 0.779 14 0.47 64.32  0.73 97.1 150.8 116.8 3.42Not submitted

TABLE 2ADimethylsilanediylbis{1-[2,5-dimethyl-4-phenylindenyl]}zirconiumdichloride Cat. Time C₂=/C₃= Amount Yield Efficiency C₂= H₂ split flowrates RUN # TEMP (° C.) (mg) (g) (Kg/g cat) (delta psi) (delta psi)(min.) (l/min.) 15 70 46 40.0 0.87 0 0 60 — 16 70 20 72.1 3.61 0 35 60 —17 60 31 151.5 4.89 0 35 60/90 4.0/1.0 18 70 30 99.9 3.33 0 35 60 — 1960 30 149.5 4.98 0 35 60/90 4.1/0.9 20 60 30 140.4 4.68 0 35 60/903.6/1.4 21 60 46 109.7 2.38 20 0 60 — 22 60 45 82.4 1.83 10 0 60 —

TABLE 2BDimethylsilanediylbis{1-[2,5-dimethyl-4-phenylindenyl]}zirconiumdichloride Total Ethylene in Total Melting IV of Ethylene Rubber RubberFinal MFR Point MW Copolymer RUN # (wt %) (wt %) (wt %) (g/10 min.) (°C.) (×10⁻³) MWD (dl/g) 15 — — — 0.044 150.5 >843*    2.02 — 16 — — —11.27 150.43 203.6 3.20 — 17 11.21 55.35 20.3 2.37 151.17 264.0 3.361.88 18 — — — 6.58 150.23 238.5 3.93 — 19 12.53 55.77 27.5 2.08 150.63256.5 3.67 2.06 20 7.122 47.38 15.0 6.34 150.77 209.7 3.64 2.00 21 1.60.067 137.83 739.3 3.68 22 0.29 0.034 143.3 716.1 3.28 *GPC run at ¼concentration

TABLE 3A Dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride Time C₂=/C₃= TEMP Cat.Amount Efficiency H₂ split flow rates RUN # (° C.) (mg) Yield (g) (Kg/gcat) (delta psi) (min.) (l/min.) 23 70 46 47.1 1.02 0 60 — 24 70 32274.6 8.58 35 60 — 25 70 21 194.9 9.28 35 60 — 26 60 21 203.4 9.69 3560/90 4.0/1.0 27 60 20 209.9 10.50 35 60/90 4.1/0.9 28 60 21 177.9 8.4835 60/90 3.6/1.4 29 60 20 156.5 7.83 40 60/90 4.0/1.0 30 70 20 118.65.93 40 60 —

TABLE 3BDimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconiumdichloride Total IV of Total Ethylene Ethylene in Rubber Final MFRMelting Point MW Copolymer RUN # (wt %) Rubber (wt %) (wt %) (g/10 min.)(° C.) (×10⁻³) MWD (dl/g) 23 — — — 0.007 151.57 993.9 2.14 — 24 — — —2.77 152.03 339.6 6.04 — 25 — — — 0.033 151.37 499.5 3.41 — 26 6.11147.50 12.9 1.65 152.37 310.6 5.22 2.23 27 7.413 50.01 14.8 1.87 151.97299.7 5.10 2.71 28 4.154 36.35 11.4 5.82 152.17 230.2 5.26 1.99 29 6.05246.16 13.1 1041 151.43 181.8 6.73 2.21 30 — — — 3.05 151.23 326.9 8.97 —

TABLE 4A Dimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium dichloride Cat. Time C₂=/C₃=TEMP. Amount Yield Efficiency C₂= H₂ split flow rates RUN # (° C.) (mg)(g) (Kg/g cat) (delta psi) (delta psi) (min.) (l/min.) 31 70 46 17.70.36 0 0 60 — 32 70 32 107.3 3.35 0 35 60 — 33 60 32 115.5 3.61 0 3560/90 4.0/1.0 34 60 32 115.7 3.62 0 35 60/90 4.1/0.9 35 60 31 107.3 3.460 35 60/90 3.6/1.4 36 60 46 45.1 0.98 10 0 60 — 37 60 45 70.2 1.56 20 060 —

TABLE 4BDimethylsilanediylbis{1-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconiumdichloride Total IV of Total Ethylene Ethylene in Rubber Final MFRMelting Point MW Copolymer RUN # (wt %) Rubber(wt %) (wt %) (g/10 min.)(° C.) (×10⁻³) MWD (dl/g) 31 — — — 0.197 152.70 550.3 2.06 — 32 — — —152.28 150.77 135.3 4.52 — 33 6.344 36.81 17.2 169.18 150.83 122.3 5.261.67 34 7.205 38.83 18.6 73.99 151.37 150.4 4.42 1.65 35 4.768 21.5527.1 146.58 150.43 120.2 4.34 1.79 36 1.0 — — 0.25 143.57 496.9 2.61 —37 1.8 — — 0.29 139.17 473.2 2.57 —

1. A compound represented by the formula:

wherein: M¹ is selected from titanium, zirconium, hafnium, vanadium,niobium, tantalum, chromium, molybdenum or tungsten; R¹ and R² areselected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkyl groups, C₁–C₁₀alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups, C₂–C₁₀ alkenylgroups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups or C₇–C₄₀arylalkenyl groups; or R¹ and R² are joined together to form a C₄–C₄₀alkanediyl group or a conjugated C₄–C₄₀ diene ligand which iscoordinated to M¹ in a metallacyclopentene fashion; or R¹ and R²represent a conjugated diene; R³ is selected from hydrogen, halogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃, or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ arylgroups; R⁴, R⁶ and R⁷ are each independently selected from hydrogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ arylgroups; or R⁶ and R⁷ together with the atoms connecting them may formone or more rings; R⁵ is selected from halogen, C₁–C₁₀ alkyl groups,C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups,C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′,—SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ is independentlyselected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ aryl groups;provided that if R⁶ is methyl, R⁵ is different from R⁶; R⁸, R⁹, R¹⁰, R¹¹and R¹² are each independently as defined for R⁴, R⁶ and R⁷, providedthat if R⁸, R⁹, R¹¹ and R¹² all are hydrogen, then at least one of R³,R⁵ and R¹⁰ is different from methyl, with R¹⁰ being different fromhydrogen; and further provided that if R⁸, R¹⁰ and R¹² all are hydrogen,R³ is ethyl and R⁵ is methyl, then at least one of R⁹ and R¹¹ isdifferent from methyl; R¹³ is selected from

 —B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)—, —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— or —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—; wherein:R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups orC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and M³ is selected from carbon, silicon,germanium or tin; or R¹³ is represented by the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsor C₈–C₄₀ arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸,R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together withthe atoms connecting them, form one or more rings; and M² represents oneor more carbon atoms, or a silicon, germanium or tin atom.
 2. Thecompound of claim 1, wherein M¹ is selected from titanium, zirconium orhafnium.
 3. The compound of claim 2, wherein R¹ and R² are selected fromchlorine, C₁–C₆ alkyl groups, C₆–C₁₀ aryl groups, C₇–C₁₂ arylalkylgroups or C₇–C₁₂ alkylaryl groups.
 4. The compound of claim 2, whereinR¹ and R² are methyl groups.
 5. The compound of claim 3, wherein R³ isselected from C₁–C₆ alkyl groups or phenyl.
 6. The compound of claim 3,wherein R³ is selected from C₁–C₄ alkyl groups.
 7. The compound of claim2, wherein R³ is an isopropyl group.
 8. The compound of claim 1, whereinat least one of R⁴ and R⁸ is hydrogen.
 9. The compound of claim 8,wherein R⁵ is selected from C₁–C₆ alkyl groups or C₆–C₁₀ aryl groups.10. The compound of claim 5, wherein R⁵ is selected from C₁–C₄ alkylgroups or phenyl.
 11. The compound of claim 6, wherein R⁵ is methyl. 12.The compound of claim 8, wherein R¹² is hydrogen.
 13. The compound ofclaim 9, wherein R¹² is hydrogen and at least one of R⁹ and R¹¹ isdifferent from hydrogen.
 14. The compound of claim 6, wherein each ofR⁴, R⁸ and R¹² is hydrogen.
 15. The compound of claim 2, wherein R¹ andR² are selected from chlorine, methyl, neopentyl or benzyl, R³ isselected from C₁–C₄ alkyl groups, each of R⁴, R⁸ and R¹² is hydrogen,and R⁵ is selected from C₁–C₄ alkyl groups or C₆–C₁₀ aryl groups. 16.The compound of claim 1, wherein R³ is selected from branched C₃–C₄alkyl groups and R⁵ is selected from C₁–C₄ alkyl groups.
 17. Thecompound of claim 8, wherein R³ is selected from isopropyl, isobutyl,sec-butyl, tert-butyl or phenyl groups, and R⁵ is selected from methyl,ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl,phenyl, tolyl, benzyl or naphthyl groups.
 18. The compound of claim 2,wherein M³ is selected from carbon or silicon, and R¹⁴, R¹⁵ and R¹⁶ areindependently selected from C₁–C₄ alkyl groups or C₆–C₁₀ aryl groups.19. The compound of claim 1, wherein M¹ is selected from zirconium orhafnium; R¹ and R² are selected from chlorine, C₁–C₄ alkyl groups orC₆–C₁₀ aryl groups; R³ is selected from C₁–C₄ alkyl groups or C₆–C₁₀aryl groups; R⁴ and R⁸ are hydrogen; R⁶, R⁷, R⁹, R¹⁰, R¹¹ and R¹² areeach independently selected from hydrogen or C₁–C₄ alkyl groups; R⁵ isselected from C₁–C₆ alkyl groups or C₆–C₁₀ aryl groups; and R¹³ isselected from di(C₁–C₄alkyl)silanediyl, diphenylsilanediyl, (C₁–C₄alkyl)phenylsilanediyl, diphenylmethanediyl, C₂–C₄ alkanediyl oralkenediyl radicals or groups of the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen or C₁–C₃ alkyl groups; andM² represents a carbon or silicon atom.
 20. The compound of claim 15,wherein R¹³ is selected from di(C₁–C₄ alkyl)silanediyl,diphenylsilanediyl, (C₁–C₄ alkyl)phenylsilanediyl, C₂–C₄ alkanediyl andalkenediyl, di(C₁–C₄ alkyl)amidoborane or bis[tri(C₁–C₄alkyl)lsilyl]amidoborane radicals.
 21. The compound of claim 1, whichcomprises not more than 2% of the meso form.
 22. A catalyst compoundrepresented by the formula,

wherein: M¹ is selected from titanium, zirconium, hafnium, vanadium,niobium, tantalum, chromium, molybdenum or tungsten; R¹ and R² areselected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkyl groups, C₁–C₁₀alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups, C₂–C₁₀ alkenylgroups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups or C₇–C₄₀arylalkenyl groups; or R¹ and R² are joined together to form a C₄–C₄₀alkanediyl group or a conjugated C₄–C₄₀ diene ligand which iscoordinated to M¹ in a metallacyclopentene fashion; or R¹ and R²represent a conjugated diene; R³ is selected from hydrogen, halogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃, or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ arylgroups; R⁴, R⁶ and R⁷ are each independently selected from hydrogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ arylgroups; or R⁶ and R⁷ together with the atoms connecting them may formone or more rings; R⁵ is selected from C₁–C₆ alkyl groups or C₆–C₁₀ arylgroups; provided that if R⁶ is methyl, R⁵ is different from R⁶; R⁸ andR¹⁰ are each independently as defined for R⁴, R⁶ and R⁷, provided thatif R⁸ and R¹² all are hydrogen, then at least one of R³, R⁵ and R¹⁰ isdifferent from methyl, with R¹⁰ being different from hydrogen; andfurther provided that if R⁸, R¹⁰ and R¹² all are hydrogen, R³ is ethyland R⁵ is methyl, then at least one of R⁹ and R¹¹ is different frommethyl; at least one of R⁴ and R⁸ is hydrogen; at least one of R⁹ andR¹¹ is a C₁–C₄ alkyl group or a phenyl group; R¹² is hydrogen; and R¹³is selected from

 —B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)—, —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— or —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—; wherein:R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups orC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and M³ is selected from carbon, silicon,germanium or tin; or R¹³ is represented by the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsor C₈–C₄₀ arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸,R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together withthe atoms connecting them, form one or more rings; and M² represents oneor more carbon atoms, or a silicon, germanium or tin atom.
 23. Acatalyst compound represented by the formula:

wherein: M¹ is selected from titanium, zirconium or hafnium; R¹ and R²are selected from chlorine, C₁–C₆ alkyl groups, C₆–C₁₀ aryl groups,C₇–C₁₂ arylalkyl groups or C₇–C₁₂ alkylaryl groups; R³ is selected fromC₁–C₆ alkyl groups or phenyl; R⁴, R⁶ and R⁷ are each independentlyselected from hydrogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀arylalkenyl groups, —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃, or —PR′₂radicals wherein each R′ is independently selected from halogen, C₁–C₁₀alkyl groups or C₆–C₁₄ aryl groups; or R⁶ and R⁷ together with the atomsconnecting them may form one or more rings; R⁵ is selected from C₁–C₄alkyl groups or phenyl; provided that if R⁶ is methyl, R⁵ is differentfrom R⁶; R⁸, R¹⁰ and R¹² are each independently as defined for R⁴, R⁶and R⁷, and further provided that if R⁸, R¹⁰ and R¹² all are hydrogen,R³ is ethyl and R⁵ is methyl, then at least one of R⁹ and R¹¹ isdifferent from methyl; R⁹ and R¹¹ are selected from methyl or tert-butylgroups; R¹³ is selected from

 —B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)—, —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— or —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—; wherein:R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups orC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and M³ is selected from carbon, silicon,germanium or tin; or R¹³ is represented by the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsor C₈–C₄₀ arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸,R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together withthe atoms connecting them, form one or more rings; and M² represents oneor more carbon atoms, or a silicon, germanium or tin atom.
 24. Acompound represented by the formula:

wherein: M¹ is selected from titanium, zirconium, hafnium, vanadium,niobium, tantalum, chromium, molybdenum or tungsten; R¹ and R² areselected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkyl groups, C₁–C₁₀alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups, C₂–C₁₀ alkenylgroups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups or C₇–C₄₀arylalkenyl groups; or R¹ and R² are joined together to form analkanediyl group or a conjugated C₄–C₄₀ diene ligand which iscoordinated to M¹ in a metallacyclopentene fashion; or R¹ and R²represent a conjugated diene; R³ is selected from hydrogen, halogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ arylgroups; R⁴, R⁶ and R⁷ are each independently selected from hydrogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ arylgroups; or R⁶ and R⁷ together with the atoms connecting them may formone or more rings; R⁵ is selected from halogen, C₁–C₁₀ alkyl groups,C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups,C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′,—SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ is independentlyselected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ aryl groups,provided that if R⁶ is methyl, R⁵ is different from R⁶; R⁸, R⁹, R¹⁰, R¹¹and R¹² are each independently as defined for R⁴, R⁶ and R⁷, providedthat two or more adjacent radicals R⁸, R⁹, R¹⁰, R¹¹ and R¹² togetherwith the atoms connecting them may form one or more rings; R¹³ isselected from diphenylsilanediyl, (C₁–C₄ alkyl)phenylsilanediyl,di(C₁–C₄ alkyl)amidoborane bis[tri(C₁–C₄ alkyl)silyl]amidoboraneradicals or groups of the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsor C₈–C₄₀ arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸,R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together withthe atoms connecting them, form one or more rings; and M² represents acarbon, silicon or germanium atom.
 25. The compound of claim 24, whereinR³ is selected from C₁–C₆ alkyl groups or phenyl.
 26. The compound ofclaim 24, wherein R³ is selected from branched C₁–C₄ alkyl groups. 27.The compound of claim 26, wherein R³ is an isopropyl group.
 28. Thecompound of claim 25, wherein R⁵ is selected from C₁–C₆ alkyl groups orC₆–C₁₀ aryl groups.
 29. The compound of claim 25, wherein R¹² ishydrogen.
 30. The compound of claim 29, wherein each of R⁴ and R⁸ ishydrogen.
 31. The compound of claim 24, wherein R³ is selected fromgroups of the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen or C₁–C₃ alkyl groups; andM² represents a carbon or silicon atom.
 32. The compound of claim 24,wherein R¹ and R² each represent a conjugated diene that is substitutedwith one or more groups selected from hydrocarbyl, trihydrocarbylsilylor trihydrocarbylsilylhydrocarbyl groups, said diene having a total ofup to 40 atoms not counting hydrogen and forming a π complex with M¹.33. A compound represented by the formula:

wherein: M¹ is selected from titanium, zirconium or hafnium; R¹ and R²are selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkyl groups,C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups, C₂–C₁₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups orC₇–C₄₀ arylalkenyl groups, provided that at least one of R¹ and R² isdifferent from halogen; or R¹ and R² are joined together to form aC₄–C₄₀ alkanediyl group or a conjugated C₄–C₄₀ diene ligand which iscoordinated to M¹ in a metallacyclopentene fashion; or R¹ and R²represent a conjugated diene; R³ is selected from hydrogen, halogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃, or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ arylgroups; R⁴, R⁶ and R⁷ are each independently selected from hydrogen,C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀arylalkyl groups, C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups,—NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ isindependently selected from halogen, C₁–C₁₀ alkyl groups and C₆–C₁₄ arylgroups; or R⁶ and R⁷ together with the atoms connecting them may formone or more rings; R⁵ is selected from halogen, C₁–C₁₀ alkyl groups,C₆–C₁₄ aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups,C₇–C₄₀ alkylaryl groups, C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′,—SiR′₃, —OSiR′₃ or —PR′₂ radicals wherein each R′ is independentlyselected from halogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ aryl groups,provided that if R⁶ is methyl, R⁵ is different from R⁶; R⁸, R⁹, R¹⁰, R¹¹and R¹² are each independently as defined for R⁴, R⁶ and R⁷, providedthat two or more adjacent radicals R⁸, R⁹, R¹⁰, R¹¹ and R¹² togetherwith the atoms connecting them may form one or more rings; R¹³ isselected from

—B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)—, —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— or —B[N(SiR¹⁴R¹⁵R¹⁶)₂]; wherein:R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups orC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and M³ is selected from carbon, silicon,germanium or tin; or R¹³ is represented by the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsor C₈–C₄₀ arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸,R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together withthe atoms connecting them, form one or more rings; and M² represents oneor more carbon atoms, or a silicon, germanium or tin atom.
 34. Acompound represented by the formula:

wherein: M¹ is selected from titanium, zirconium, hafnium, vanadium,niobium, tantalum, chromium, molybdenum or tungsten; R¹ and R² eachrepresent a conjugated diene that is substituted with one or more groupsselected from hydrocarbyl, trihydrocarbylsilyl ortrihydrocarbylsilylhydrocarbyl groups, said diene having a total of upto 40 atoms not counting hydrogen and forming a π complex with M¹; R³ isselected from hydrogen, halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ arylgroups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylarylgroups, C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃,or —PR′₂ radicals wherein each R′ is independently selected fromhalogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ aryl groups, R⁴, R⁶ and R⁷ areeach independently selected from hydrogen, C₁–C₁₀ alkyl groups, C₆–C₁₄aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀alkylaryl groups, C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′, —SiR′₃,—OSiR′₃ or —PR′₂ radicals wherein each R′ is independently selected fromhalogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ aryl groups; or R⁶ and R⁷together with the atoms connecting them may form one or more rings; R⁵is selected from halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups,C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ or —PR′₂radicals wherein each R′ is independently selected from halogen, C₁–C₁₀alkyl groups or C₆–C₁₄ aryl groups; provided that if R⁶ is methyl, R⁵ isdifferent from R⁶; R⁸, R⁹, R¹⁰, R¹¹ and R¹² are each independently asdefined for R⁴, R⁶ and R⁷, provided that if R⁸, R⁹, R¹¹ and R¹² all arehydrogen, then at least one of R³, R⁵ and R¹⁰ is different from methyl,with R¹⁰ being different from hydrogen; and further provided that if R⁸,R¹⁰ and R¹² all are hydrogen, R³ is ethyl and R⁵ is methyl, then atleast one of R⁹ and R¹¹ is different from methyl; R¹³ is selected from

 —B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)—, —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— or —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—; wherein:R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups orC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and M³ is selected from carbon, silicon,germanium or tin; or R¹³ is represented by the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsor C₈–C₄₀ arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸,R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together withthe atoms connecting them, form one or more rings; and M² represents oneor more carbon atoms, or a silicon, germanium or tin atom.
 35. Acompound represented by the formula:

wherein: M¹ is selected from titanium, zirconium or hafnium; R¹ and R²each represent a conjugated diene that is substituted with one or moregroups selected from hydrocarbyl, trihydrocarbylsilyl ortrihydrocarbylsilylhydrocarbyl groups, said diene having a total of upto 40 atoms not counting hydrogen and forming a π complex with M¹; R³ isselected from hydrogen, halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ arylgroups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylarylgroups, C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃,or —PR′₂ radicals wherein each R′ is independently selected fromhalogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ aryl groups; R⁴, R⁶ and R⁷ areeach independently selected from hydrogen, C₁–C₁₀ alkyl groups, C₆–C₁₄aryl groups, C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀alkylaryl groups, C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′, —SiR′₃,—OSiR′₃ or —PR′₂ radicals wherein each R′ is independently selected fromhalogen, C₁–C₁₀ alkyl groups or C₆–C₁₄ aryl groups; or R⁶ and R⁷together with the atoms connecting them may form one or more rings; R⁵is selected from halogen, C₁–C₁₀ alkyl groups, C₆–C₁₄ aryl groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groups,C₈–C₄₀ arylalkenyl groups, —NR′₂, —SR′, —OR′, —SiR′₃, —OSiR′₃ or —PR′₂radicals wherein each R′ is independently selected from halogen, C₁–C₁₀alkyl groups or C₆–C₁₄ aryl groups, provided that if R⁶ is methyl, R⁵ isdifferent from R⁶; R⁸, R⁹, R¹⁰, R¹¹ and R¹² are each independently asdefined for R⁴, R⁶ and R⁷, provided that two or more adjacent radicalsR⁸, R⁹, R¹⁰, R¹¹ and R¹² together with the atoms connecting them mayform one or more rings; R¹³ is selected from

 —B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)—, —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— or —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—; wherein:R¹⁴, R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁–C₂₀ alkyl groups, C₆–C₃₀ aryl groups, C₁–C₂₀ alkoxy groups, C₂–C₂₀alkenyl groups, C₇–C₄₀ arylalkyl groups, C₈–C₄₀ arylalkenyl groups orC₇–C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and M³ is selected from carbon, silicon,germanium or tin; or R¹³ is represented by the formula

wherein: R¹⁷, R¹⁸, R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴ are eachindependently selected from hydrogen, halogen, hydroxy, C₁–C₁₀ alkylgroups, C₁–C₁₀ alkoxy groups, C₆–C₁₄ aryl groups, C₆–C₁₄ aryloxy groups,C₂–C₁₀ alkenyl groups, C₇–C₄₀ arylalkyl groups, C₇–C₄₀ alkylaryl groupsor C₈–C₄₀ arylalkenyl groups; or two or more adjacent radicals R¹⁷, R¹⁸,R¹⁹, R²⁰, R²¹, R²², R²³ and R²⁴, including R²⁰ and R²¹, together withthe atoms connecting them, form one or more rings; and M² represents oneor more carbon atoms, or a silicon, germanium or tin atom.